diff --git a/src/components/chat/ChatToolCallBlock.tsx b/src/components/chat/ChatToolCallBlock.tsx
index a7f2c79..a552a00 100644
--- a/src/components/chat/ChatToolCallBlock.tsx
+++ b/src/components/chat/ChatToolCallBlock.tsx
@@ -25,6 +25,11 @@ import {
   type ChatToolAction,
 } from "@/store/chatToolStore";
 import type { ToolCall } from "./chatMessageSections";
+import {
+  APPLY_LAYER_STYLE_TOOL,
+  describeApplyLayerStyle,
+  parseApplyLayerStylePayload,
+} from "./toolCallStyleHelpers";
 
 /* ------------------------------------------------------------------ */
 /*  Interactive card rendered inside a chat bubble for tool actions    */
@@ -137,6 +142,12 @@ const TOOL_META: Record<string, ToolMeta> = {
     actionLabel: "应用渲染",
     color: "#3b82f6",
   },
+  [APPLY_LAYER_STYLE_TOOL]: {
+    label: "图层样式",
+    icon: <LocationOnRounded sx={{ fontSize: 18 }} />,
+    actionLabel: "应用样式",
+    color: "#14b8a6",
+  },
 };
 
 /* ---------- helpers ---------- */
@@ -270,6 +281,10 @@ function getToolDescription(toolCall: ToolCall): string {
     case "render_junctions": {
       return (params.render_ref as string | undefined) ?? "渲染引用";
     }
+    case APPLY_LAYER_STYLE_TOOL: {
+      const payload = parseApplyLayerStylePayload(params);
+      return payload ? describeApplyLayerStyle(payload) : "图层样式";
+    }
     default:
       return "";
   }
@@ -403,6 +418,18 @@ function buildAction(toolCall: ToolCall): ChatToolAction | null {
         renderRef,
       };
     }
+    case APPLY_LAYER_STYLE_TOOL: {
+      const payload = parseApplyLayerStylePayload(params);
+      if (!payload) {
+        return null;
+      }
+      return {
+        type: "apply_layer_style",
+        layerId: payload.layerId,
+        resetToDefault: payload.resetToDefault,
+        styleConfig: payload.styleConfig,
+      };
+    }
     default:
       return null;
   }
diff --git a/src/components/chat/hooks/useAgentToolActions.ts b/src/components/chat/hooks/useAgentToolActions.ts
index e8bd878..ff9191a 100644
--- a/src/components/chat/hooks/useAgentToolActions.ts
+++ b/src/components/chat/hooks/useAgentToolActions.ts
@@ -5,6 +5,11 @@ import { useCallback } from "react";
 import { useChatToolStore, type ChatToolAction } from "@/store/chatToolStore";
 import type { StreamEvent } from "@/lib/chatStream";
 import type { AgentArtifact, AgentArtifactKind } from "../GlobalChatbox.types";
+import {
+  APPLY_LAYER_STYLE_TOOL,
+  describeApplyLayerStyle,
+  parseApplyLayerStylePayload,
+} from "../toolCallStyleHelpers";
 
 type ToolCallEvent = StreamEvent & { type: "tool_call" };
 
@@ -248,6 +253,23 @@ const buildToolAction = (
     };
   }
 
+  if (tool === APPLY_LAYER_STYLE_TOOL) {
+    const payload = parseApplyLayerStylePayload(params);
+    return {
+      action: payload
+        ? {
+            type: "apply_layer_style",
+            layerId: payload.layerId,
+            resetToDefault: payload.resetToDefault,
+            styleConfig: payload.styleConfig,
+          }
+        : null,
+      kind: "map",
+      title: payload?.resetToDefault ? "重置图层样式" : "应用图层样式",
+      description: payload ? describeApplyLayerStyle(payload) : "图层样式",
+    };
+  }
+
   return {
     action: null,
     kind: "tool",
diff --git a/src/components/chat/toolCallStyleHelpers.ts b/src/components/chat/toolCallStyleHelpers.ts
new file mode 100644
index 0000000..578c097
--- /dev/null
+++ b/src/components/chat/toolCallStyleHelpers.ts
@@ -0,0 +1,150 @@
+import type { StyleConfig, DefaultLayerStyleId } from "@components/olmap/core/Controls/styleEditorTypes";
+
+export type ApplyLayerStyleActionPayload = {
+  layerId: DefaultLayerStyleId;
+  resetToDefault: boolean;
+  styleConfig?: Partial<StyleConfig>;
+};
+
+export const APPLY_LAYER_STYLE_TOOL = "apply_layer_style";
+
+const LAYER_LABELS: Record<DefaultLayerStyleId, string> = {
+  junctions: "节点",
+  pipes: "管道",
+};
+
+const asString = (value: unknown): string | undefined =>
+  typeof value === "string" && value.trim() ? value.trim() : undefined;
+
+const asNumber = (value: unknown): number | undefined =>
+  typeof value === "number" && Number.isFinite(value)
+    ? value
+    : typeof value === "string" && value.trim() && Number.isFinite(Number(value))
+      ? Number(value)
+      : undefined;
+
+const asBoolean = (value: unknown): boolean | undefined =>
+  typeof value === "boolean"
+    ? value
+    : typeof value === "string"
+      ? value === "true"
+        ? true
+        : value === "false"
+          ? false
+          : undefined
+      : undefined;
+
+const asNumberArray = (value: unknown): number[] | undefined =>
+  Array.isArray(value)
+    ? value
+        .map((item) => asNumber(item))
+        .filter((item): item is number => item !== undefined)
+    : undefined;
+
+const asStringArray = (value: unknown): string[] | undefined =>
+  Array.isArray(value)
+    ? value
+        .map((item) => asString(item))
+        .filter((item): item is string => item !== undefined)
+    : undefined;
+
+export const normalizeStyleLayerId = (value: unknown): DefaultLayerStyleId | null => {
+  const normalized = asString(value)?.toLowerCase();
+  if (normalized === "junctions" || normalized === "pipes") {
+    return normalized;
+  }
+  return null;
+};
+
+export const getStyleLayerLabel = (layerId: DefaultLayerStyleId): string =>
+  LAYER_LABELS[layerId];
+
+export const parseApplyLayerStylePayload = (
+  params: Record<string, unknown>,
+): ApplyLayerStyleActionPayload | null => {
+  const layerId = normalizeStyleLayerId(params.layer_id ?? params.layerId);
+  if (!layerId) {
+    return null;
+  }
+
+  const resetToDefault = Boolean(
+    asBoolean(params.reset_to_default ?? params.resetToDefault),
+  );
+  const rawStyleConfig =
+    params.style_config && typeof params.style_config === "object"
+      ? (params.style_config as Record<string, unknown>)
+      : params.styleConfig && typeof params.styleConfig === "object"
+        ? (params.styleConfig as Record<string, unknown>)
+        : null;
+
+  const styleConfig: Partial<StyleConfig> | undefined = rawStyleConfig
+    ? {
+        property: asString(rawStyleConfig.property),
+        classificationMethod: asString(
+          rawStyleConfig.classification_method ?? rawStyleConfig.classificationMethod,
+        ),
+        segments: asNumber(rawStyleConfig.segments),
+        minSize: asNumber(rawStyleConfig.min_size ?? rawStyleConfig.minSize),
+        maxSize: asNumber(rawStyleConfig.max_size ?? rawStyleConfig.maxSize),
+        minStrokeWidth: asNumber(
+          rawStyleConfig.min_stroke_width ?? rawStyleConfig.minStrokeWidth,
+        ),
+        maxStrokeWidth: asNumber(
+          rawStyleConfig.max_stroke_width ?? rawStyleConfig.maxStrokeWidth,
+        ),
+        fixedStrokeWidth: asNumber(
+          rawStyleConfig.fixed_stroke_width ?? rawStyleConfig.fixedStrokeWidth,
+        ),
+        colorType: asString(rawStyleConfig.color_type ?? rawStyleConfig.colorType),
+        singlePaletteIndex: asNumber(
+          rawStyleConfig.single_palette_index ?? rawStyleConfig.singlePaletteIndex,
+        ),
+        gradientPaletteIndex: asNumber(
+          rawStyleConfig.gradient_palette_index ?? rawStyleConfig.gradientPaletteIndex,
+        ),
+        rainbowPaletteIndex: asNumber(
+          rawStyleConfig.rainbow_palette_index ?? rawStyleConfig.rainbowPaletteIndex,
+        ),
+        showLabels: asBoolean(rawStyleConfig.show_labels ?? rawStyleConfig.showLabels),
+        showId: asBoolean(rawStyleConfig.show_id ?? rawStyleConfig.showId),
+        opacity: asNumber(rawStyleConfig.opacity),
+        adjustWidthByProperty: asBoolean(
+          rawStyleConfig.adjust_width_by_property ??
+            rawStyleConfig.adjustWidthByProperty,
+        ),
+        customBreaks: asNumberArray(
+          rawStyleConfig.custom_breaks ?? rawStyleConfig.customBreaks,
+        ),
+        customColors: asStringArray(
+          rawStyleConfig.custom_colors ?? rawStyleConfig.customColors,
+        ),
+      }
+    : undefined;
+
+  const hasStyleOverrides =
+    styleConfig &&
+    Object.values(styleConfig).some((value) =>
+      Array.isArray(value) ? value.length > 0 : value !== undefined,
+    );
+
+  if (!resetToDefault && !hasStyleOverrides) {
+    return null;
+  }
+
+  return {
+    layerId,
+    resetToDefault,
+    styleConfig: hasStyleOverrides ? styleConfig : undefined,
+  };
+};
+
+export const describeApplyLayerStyle = (
+  payload: ApplyLayerStyleActionPayload,
+): string => {
+  const layerLabel = getStyleLayerLabel(payload.layerId);
+  if (payload.resetToDefault) {
+    return `${layerLabel} · 重置默认样式`;
+  }
+  const property = payload.styleConfig?.property;
+  return property ? `${layerLabel} · ${property}` : `${layerLabel} · 应用样式`;
+};
diff --git a/src/components/olmap/core/Controls/StyleEditorPanel.tsx b/src/components/olmap/core/Controls/StyleEditorPanel.tsx
index 946cd3a..afc1686 100644
--- a/src/components/olmap/core/Controls/StyleEditorPanel.tsx
+++ b/src/components/olmap/core/Controls/StyleEditorPanel.tsx
@@ -2,34 +2,25 @@ import React from "react";
 
 import StyleEditorForm from "./StyleEditorForm";
 import { createDefaultLayerStyleState, createDefaultLayerStyleStates } from "./styleEditorPresets";
-import { useStyleEditor } from "./useStyleEditor";
 import { LayerStyleState, StyleConfig, StyleEditorPanelProps } from "./styleEditorTypes";
 
 const StyleEditorPanel: React.FC<StyleEditorPanelProps> = ({
-  layerStyleStates,
-  setLayerStyleStates,
+  isReady,
+  renderLayers,
+  selectedRenderLayer,
+  styleConfig,
+  setStyleConfig,
+  availableProperties,
+  onLayerChange,
+  onPropertyChange,
+  onClassificationMethodChange,
+  onSegmentsChange,
+  onCustomBreakChange,
+  onCustomBreakBlur,
+  onColorTypeChange,
+  onApply,
+  onReset,
 }) => {
-  const {
-    isReady,
-    renderLayers,
-    selectedRenderLayer,
-    styleConfig,
-    setStyleConfig,
-    availableProperties,
-    handleLayerChange,
-    handlePropertyChange,
-    handleClassificationMethodChange,
-    handleSegmentsChange,
-    handleCustomBreakChange,
-    handleCustomBreakBlur,
-    handleColorTypeChange,
-    handleApply,
-    handleReset,
-  } = useStyleEditor({
-    layerStyleStates,
-    setLayerStyleStates,
-  });
-
   if (!isReady) {
     return <div>Loading...</div>;
   }
@@ -41,15 +32,15 @@ const StyleEditorPanel: React.FC<StyleEditorPanelProps> = ({
       styleConfig={styleConfig}
       setStyleConfig={setStyleConfig}
       availableProperties={availableProperties}
-      onLayerChange={handleLayerChange}
-      onPropertyChange={handlePropertyChange}
-      onClassificationMethodChange={handleClassificationMethodChange}
-      onSegmentsChange={handleSegmentsChange}
-      onCustomBreakChange={handleCustomBreakChange}
-      onCustomBreakBlur={handleCustomBreakBlur}
-      onColorTypeChange={handleColorTypeChange}
-      onApply={handleApply}
-      onReset={handleReset}
+      onLayerChange={onLayerChange}
+      onPropertyChange={onPropertyChange}
+      onClassificationMethodChange={onClassificationMethodChange}
+      onSegmentsChange={onSegmentsChange}
+      onCustomBreakChange={onCustomBreakChange}
+      onCustomBreakBlur={onCustomBreakBlur}
+      onColorTypeChange={onColorTypeChange}
+      onApply={onApply}
+      onReset={onReset}
     />
   );
 };
diff --git a/src/components/olmap/core/Controls/Toolbar.tsx b/src/components/olmap/core/Controls/Toolbar.tsx
index 333434e..772123d 100644
--- a/src/components/olmap/core/Controls/Toolbar.tsx
+++ b/src/components/olmap/core/Controls/Toolbar.tsx
@@ -24,6 +24,7 @@ import {
   buildFeatureProperties,
 } from "./toolbarFeatureHelpers";
 import { useToolbarChatActions } from "./useToolbarChatActions";
+import { useStyleEditor } from "./useStyleEditor";
 
 import { config } from "@/config/config";
 import { apiFetch } from "@/lib/apiFetch";
@@ -81,20 +82,27 @@ const Toolbar: React.FC<ToolbarProps> = ({
     endTime?: string;
   } | null>(null);
 
+  // 样式状态管理 - 在 Toolbar 中管理，带有默认样式
+  const [layerStyleStates, setLayerStyleStates] = useState<LayerStyleState[]>(
+    () => createDefaultLayerStyleStates()
+  );
+  const styleEditor = useStyleEditor({
+    layerStyleStates,
+    setLayerStyleStates,
+  });
+
   useToolbarChatActions({
     setHighlightFeatures,
     setChatPanelFeatureInfos,
     setChatPanelType,
     setChatPanelTimeRange,
     setShowHistoryPanel,
+    setShowStyleEditor,
     setActiveTools,
+    applyExternalStyle: styleEditor.applyExternalStyle,
+    resetExternalStyle: styleEditor.resetExternalStyle,
   });
 
-  // 样式状态管理 - 在 Toolbar 中管理，带有默认样式
-  const [layerStyleStates, setLayerStyleStates] = useState<LayerStyleState[]>(
-    () => createDefaultLayerStyleStates()
-  );
-
   // 计算激活的图例配置
   const activeLegendConfigs = layerStyleStates
     .filter((state) => state.isActive && state.legendConfig.property)
@@ -444,8 +452,21 @@ const Toolbar: React.FC<ToolbarProps> = ({
       {showDrawPanel && map && <DrawPanel />}
       <div style={{ display: showStyleEditor ? "block" : "none" }}>
         <StyleEditorPanel
-          layerStyleStates={layerStyleStates}
-          setLayerStyleStates={setLayerStyleStates}
+          isReady={styleEditor.isReady}
+          renderLayers={styleEditor.renderLayers}
+          selectedRenderLayer={styleEditor.selectedRenderLayer}
+          styleConfig={styleEditor.styleConfig}
+          setStyleConfig={styleEditor.setStyleConfig}
+          availableProperties={styleEditor.availableProperties}
+          onLayerChange={styleEditor.handleLayerChange}
+          onPropertyChange={styleEditor.handlePropertyChange}
+          onClassificationMethodChange={styleEditor.handleClassificationMethodChange}
+          onSegmentsChange={styleEditor.handleSegmentsChange}
+          onCustomBreakChange={styleEditor.handleCustomBreakChange}
+          onCustomBreakBlur={styleEditor.handleCustomBreakBlur}
+          onColorTypeChange={styleEditor.handleColorTypeChange}
+          onApply={styleEditor.handleApply}
+          onReset={styleEditor.handleReset}
         />
       </div>
       <ToolbarHistoryPanel
diff --git a/src/components/olmap/core/Controls/styleEditorTypes.ts b/src/components/olmap/core/Controls/styleEditorTypes.ts
index 034bce7..a5eb539 100644
--- a/src/components/olmap/core/Controls/styleEditorTypes.ts
+++ b/src/components/olmap/core/Controls/styleEditorTypes.ts
@@ -34,7 +34,7 @@ export interface LayerStyleState {
 
 export type DefaultLayerStyleId = "junctions" | "pipes";
 
-export interface StyleEditorPanelProps {
+export interface StyleEditorStateProps {
   layerStyleStates: LayerStyleState[];
   setLayerStyleStates: React.Dispatch<React.SetStateAction<LayerStyleState[]>>;
 }
@@ -60,3 +60,7 @@ export interface StyleEditorFormProps {
   onApply: () => void;
   onReset: () => void;
 }
+
+export interface StyleEditorPanelProps extends StyleEditorFormProps {
+  isReady: boolean;
+}
diff --git a/src/components/olmap/core/Controls/useStyleEditor.ts b/src/components/olmap/core/Controls/useStyleEditor.ts
index 1da8a3f..d317cd3 100644
--- a/src/components/olmap/core/Controls/useStyleEditor.ts
+++ b/src/components/olmap/core/Controls/useStyleEditor.ts
@@ -25,8 +25,10 @@ import {
 } from "./styleEditorUtils";
 import {
   AvailableProperty,
+  DefaultLayerStyleId,
   LayerStyleState,
-  StyleEditorPanelProps,
+  StyleConfig,
+  StyleEditorStateProps,
 } from "./styleEditorTypes";
 import { LegendStyleConfig } from "./StyleLegend";
 import { calculateClassification } from "@utils/breaks_classification";
@@ -36,7 +38,7 @@ const UNIT_HEADLOSS_RANGE: [number, number] = [0, 5];
 export const useStyleEditor = ({
   layerStyleStates,
   setLayerStyleStates,
-}: StyleEditorPanelProps) => {
+}: StyleEditorStateProps) => {
   const map = useMap();
   const data = useData();
   const { open } = useNotification();
@@ -85,6 +87,51 @@ export const useStyleEditor = ({
     latestLayerStyleStatesRef.current = layerStyleStates;
   }, [layerStyleStates]);
 
+  const upsertLayerStyleState = useCallback(
+    (newStyleState: LayerStyleState) => {
+      const existingState = latestLayerStyleStatesRef.current.find(
+        (state) => state.layerId === newStyleState.layerId
+      );
+      if (
+        existingState &&
+        JSON.stringify(existingState.styleConfig) ===
+          JSON.stringify(newStyleState.styleConfig) &&
+        JSON.stringify(existingState.legendConfig) ===
+          JSON.stringify(newStyleState.legendConfig) &&
+        existingState.layerName === newStyleState.layerName &&
+        existingState.isActive === newStyleState.isActive
+      ) {
+        return;
+      }
+
+      setLayerStyleStates((prev) => {
+        const existingIndex = prev.findIndex(
+          (state) => state.layerId === newStyleState.layerId
+        );
+        const nextStates =
+          existingIndex === -1
+            ? [...prev, newStyleState]
+            : prev.map((state, index) =>
+                index === existingIndex ? newStyleState : state
+              );
+        latestLayerStyleStatesRef.current = nextStates;
+        return nextStates;
+      });
+    },
+    [setLayerStyleStates]
+  );
+
+  const removeLayerStyleState = useCallback(
+    (layerId: string) => {
+      setLayerStyleStates((prev) => {
+        const nextStates = prev.filter((state) => state.layerId !== layerId);
+        latestLayerStyleStatesRef.current = nextStates;
+        return nextStates;
+      });
+    },
+    [setLayerStyleStates]
+  );
+
   const getRenderLayersById = useCallback(
     (layerId: string) =>
       activeMaps.flatMap((targetMap) =>
@@ -191,28 +238,9 @@ export const useStyleEditor = ({
         isActive: true,
       };
 
-      setLayerStyleStates((prev) => {
-        const existingIndex = prev.findIndex((state) => state.layerId === layerId);
-        if (existingIndex !== -1) {
-          const existingState = prev[existingIndex];
-          if (
-            JSON.stringify(existingState.styleConfig) ===
-              JSON.stringify(newStyleState.styleConfig) &&
-            JSON.stringify(existingState.legendConfig) ===
-              JSON.stringify(newStyleState.legendConfig) &&
-            existingState.layerName === newStyleState.layerName &&
-            existingState.isActive === newStyleState.isActive
-          ) {
-            return prev;
-          }
-          const updated = [...prev];
-          updated[existingIndex] = newStyleState;
-          return updated;
-        }
-        return [...prev, newStyleState];
-      });
+      upsertLayerStyleState(newStyleState);
     },
-    [availableProperties, selectedRenderLayer, setLayerStyleStates, styleConfig]
+    [availableProperties, selectedRenderLayer, styleConfig, upsertLayerStyleState]
   );
 
   const applyContourLayerStyle = useCallback(
@@ -520,9 +548,7 @@ export const useStyleEditor = ({
       setShowJunctionTextLayer?.(styleConfig.showLabels);
       setShowJunctionId?.(styleConfig.showId);
       setApplyJunctionStyle(true);
-      if (property === "pressure") {
-        setContourLayerAvailable?.(true);
-      }
+      setContourLayerAvailable?.(property === "pressure");
       saveLayerStyle(layerId);
       open?.({
         type: "success",
@@ -571,7 +597,7 @@ export const useStyleEditor = ({
       targetLayer.setStyle(defaultFlatStyle);
     });
 
-    setLayerStyleStates((prev) => prev.filter((state) => state.layerId !== layerId));
+    removeLayerStyleState(layerId);
 
     if (layerId === "junctions") {
       setApplyJunctionStyle(false);
@@ -593,7 +619,7 @@ export const useStyleEditor = ({
     setContourLayerAvailable,
     setContours,
     setJunctionText,
-    setLayerStyleStates,
+    removeLayerStyleState,
     setPipeText,
     setShowJunctionId,
     setShowJunctionTextLayer,
@@ -602,6 +628,211 @@ export const useStyleEditor = ({
     setWaterflowLayerAvailable,
   ]);
 
+  const normalizeExternalStyleConfig = useCallback(
+    (layerId: DefaultLayerStyleId, overrides?: Partial<StyleConfig>): StyleConfig => {
+      const currentStyleState = latestLayerStyleStatesRef.current.find(
+        (state) => state.layerId === layerId
+      );
+      const baseStyleConfig =
+        currentStyleState?.styleConfig || createDefaultLayerStyleState(layerId).styleConfig;
+      const nextStyleConfig: StyleConfig = {
+        ...baseStyleConfig,
+        ...overrides,
+        customBreaks: overrides?.customBreaks
+          ? [...overrides.customBreaks]
+          : [...(baseStyleConfig.customBreaks || [])],
+        customColors: overrides?.customColors
+          ? [...overrides.customColors]
+          : [...(baseStyleConfig.customColors || [])],
+      };
+
+      nextStyleConfig.segments = Math.max(1, Math.round(nextStyleConfig.segments || 1));
+      nextStyleConfig.opacity = Math.min(1, Math.max(0, nextStyleConfig.opacity));
+      nextStyleConfig.singlePaletteIndex = Math.max(
+        0,
+        Math.round(nextStyleConfig.singlePaletteIndex || 0)
+      );
+      nextStyleConfig.gradientPaletteIndex = Math.max(
+        0,
+        Math.round(nextStyleConfig.gradientPaletteIndex || 0)
+      );
+      nextStyleConfig.rainbowPaletteIndex = Math.max(
+        0,
+        Math.round(nextStyleConfig.rainbowPaletteIndex || 0)
+      );
+      nextStyleConfig.minSize = Math.max(1, nextStyleConfig.minSize);
+      nextStyleConfig.maxSize = Math.max(nextStyleConfig.minSize, nextStyleConfig.maxSize);
+      nextStyleConfig.minStrokeWidth = Math.max(1, nextStyleConfig.minStrokeWidth);
+      nextStyleConfig.maxStrokeWidth = Math.max(
+        nextStyleConfig.minStrokeWidth,
+        nextStyleConfig.maxStrokeWidth
+      );
+      nextStyleConfig.fixedStrokeWidth = Math.max(1, nextStyleConfig.fixedStrokeWidth);
+      nextStyleConfig.customColors =
+        nextStyleConfig.colorType === "custom"
+          ? getDefaultCustomColors(
+              nextStyleConfig.segments,
+              nextStyleConfig.customColors || []
+            )
+          : nextStyleConfig.customColors;
+      nextStyleConfig.customBreaks =
+        nextStyleConfig.classificationMethod === "custom_breaks"
+          ? normalizeCustomBreaks(
+              nextStyleConfig.customBreaks ||
+                getBreakDefaults(
+                  nextStyleConfig.segments,
+                  nextStyleConfig.property,
+                  getRenderLayersById(layerId)[0]
+                ),
+              nextStyleConfig.segments
+            )
+          : nextStyleConfig.customBreaks;
+
+      return nextStyleConfig;
+    },
+    [getBreakDefaults, getRenderLayersById]
+  );
+
+  const applyExternalStyle = useCallback(
+    (layerId: DefaultLayerStyleId, overrides?: Partial<StyleConfig>) => {
+      const targetLayer = getRenderLayersById(layerId)[0];
+      if (!targetLayer) {
+        open?.({
+          type: "error",
+          message: `未找到${layerId === "junctions" ? "节点" : "管道"}图层，无法应用样式。`,
+        });
+        return;
+      }
+
+      const nextStyleConfig = normalizeExternalStyleConfig(layerId, overrides);
+      if (!nextStyleConfig.property) {
+        open?.({
+          type: "error",
+          message: "样式工具缺少有效的渲染属性，无法应用样式。",
+        });
+        return;
+      }
+
+      const layerName = targetLayer.get("name") || (layerId === "junctions" ? "节点" : "管道");
+      const targetProperties = (targetLayer.get("properties") || []) as AvailableProperty[];
+      const propertyLabel =
+        targetProperties.find((item) => item.value === nextStyleConfig.property)?.name ||
+        nextStyleConfig.property;
+
+      setSelectedRenderLayer(targetLayer);
+      setStyleConfig(nextStyleConfig);
+      upsertLayerStyleState({
+        layerId,
+        layerName,
+        styleConfig: nextStyleConfig,
+        legendConfig: {
+          layerId,
+          layerName,
+          property: propertyLabel,
+          colors: [],
+          type: targetLayer.get("type") || (layerId === "junctions" ? "point" : "linestring"),
+          dimensions: [],
+          breaks: [],
+        },
+        isActive: true,
+      });
+
+      if (layerId === "junctions") {
+        setJunctionText?.(nextStyleConfig.property);
+        setShowJunctionTextLayer?.(nextStyleConfig.showLabels);
+        setShowJunctionId?.(nextStyleConfig.showId);
+        setContourLayerAvailable?.(nextStyleConfig.property === "pressure");
+        setApplyJunctionStyle(true);
+      } else {
+        setPipeText?.(nextStyleConfig.property);
+        setShowPipeTextLayer?.(nextStyleConfig.showLabels);
+        setShowPipeId?.(nextStyleConfig.showId);
+        setWaterflowLayerAvailable?.(true);
+        setApplyPipeStyle(true);
+      }
+
+      applyClassificationStyle(layerId, nextStyleConfig);
+      open?.({
+        type: "success",
+        message: `${layerId === "junctions" ? "节点" : "管道"}图层样式已应用。`,
+      });
+    },
+    [
+      applyClassificationStyle,
+      getRenderLayersById,
+      normalizeExternalStyleConfig,
+      open,
+      setContourLayerAvailable,
+      setJunctionText,
+      setPipeText,
+      setShowJunctionId,
+      setShowJunctionTextLayer,
+      setShowPipeId,
+      setShowPipeTextLayer,
+      setWaterflowLayerAvailable,
+      upsertLayerStyleState,
+    ]
+  );
+
+  const resetExternalStyle = useCallback(
+    (layerId: DefaultLayerStyleId) => {
+      const targetLayer = getRenderLayersById(layerId)[0];
+      if (!targetLayer) {
+        open?.({
+          type: "error",
+          message: `未找到${layerId === "junctions" ? "节点" : "管道"}图层，无法重置样式。`,
+        });
+        return;
+      }
+
+      const defaultStyleConfig = createDefaultLayerStyleState(layerId).styleConfig;
+      const defaultFlatStyle: FlatStyleLike = config.MAP_DEFAULT_STYLE;
+
+      setSelectedRenderLayer(targetLayer);
+      setStyleConfig(defaultStyleConfig);
+
+      getRenderLayersById(layerId).forEach((renderLayer) => {
+        renderLayer.setStyle(defaultFlatStyle);
+      });
+
+      removeLayerStyleState(layerId);
+
+      if (layerId === "junctions") {
+        setApplyJunctionStyle(false);
+        setShowJunctionTextLayer?.(false);
+        setShowJunctionId?.(false);
+        setJunctionText?.("");
+        setContours?.([]);
+        setContourLayerAvailable?.(false);
+      } else {
+        setApplyPipeStyle(false);
+        setShowPipeTextLayer?.(false);
+        setShowPipeId?.(false);
+        setPipeText?.("");
+        setWaterflowLayerAvailable?.(false);
+      }
+
+      open?.({
+        type: "success",
+        message: `${layerId === "junctions" ? "节点" : "管道"}图层样式已重置。`,
+      });
+    },
+    [
+      getRenderLayersById,
+      open,
+      removeLayerStyleState,
+      setContourLayerAvailable,
+      setContours,
+      setJunctionText,
+      setPipeText,
+      setShowJunctionId,
+      setShowJunctionTextLayer,
+      setShowPipeId,
+      setShowPipeTextLayer,
+      setWaterflowLayerAvailable,
+    ]
+  );
+
   const handleLayerChange = useCallback(
     (index: number) => {
       const newLayer = index >= 0 ? renderLayers[index] : undefined;
@@ -747,6 +978,7 @@ export const useStyleEditor = ({
           nextStates[index] = defaultState;
         }
       });
+      latestLayerStyleStatesRef.current = nextStates;
       return nextStates;
     });
 
@@ -940,5 +1172,7 @@ export const useStyleEditor = ({
     handleColorTypeChange,
     handleApply,
     handleReset,
+    applyExternalStyle,
+    resetExternalStyle,
   };
 };
diff --git a/src/components/olmap/core/Controls/useToolbarChatActions.ts b/src/components/olmap/core/Controls/useToolbarChatActions.ts
index bf9f3a9..f29a982 100644
--- a/src/components/olmap/core/Controls/useToolbarChatActions.ts
+++ b/src/components/olmap/core/Controls/useToolbarChatActions.ts
@@ -13,6 +13,7 @@ import { apiFetch } from "@/lib/apiFetch";
 import { queryFeaturesByIds } from "@/utils/mapQueryService";
 import { config } from "@/config/config";
 import { useMap } from "../MapComponent";
+import type { DefaultLayerStyleId, StyleConfig } from "./styleEditorTypes";
 
 type UseToolbarChatActionsParams = {
   setHighlightFeatures: Dispatch<SetStateAction<Feature[]>>;
@@ -22,7 +23,13 @@ type UseToolbarChatActionsParams = {
     SetStateAction<{ startTime?: string; endTime?: string } | null>
   >;
   setShowHistoryPanel: Dispatch<SetStateAction<boolean>>;
+  setShowStyleEditor: Dispatch<SetStateAction<boolean>>;
   setActiveTools: Dispatch<SetStateAction<string[]>>;
+  applyExternalStyle: (
+    layerId: DefaultLayerStyleId,
+    styleConfig?: Partial<StyleConfig>
+  ) => void;
+  resetExternalStyle: (layerId: DefaultLayerStyleId) => void;
 };
 
 export const useToolbarChatActions = ({
@@ -31,7 +38,10 @@ export const useToolbarChatActions = ({
   setChatPanelType,
   setChatPanelTimeRange,
   setShowHistoryPanel,
+  setShowStyleEditor,
   setActiveTools,
+  applyExternalStyle,
+  resetExternalStyle,
 }: UseToolbarChatActionsParams) => {
   const map = useMap();
   const chatJunctionRenderCleanupRef = useRef<(() => void) | null>(null);
@@ -206,17 +216,30 @@ export const useToolbarChatActions = ({
             })();
             break;
           }
+          case "apply_layer_style": {
+            setShowStyleEditor(true);
+            setActiveTools((prev) => (prev.includes("style") ? prev : [...prev, "style"]));
+            if (action.resetToDefault) {
+              resetExternalStyle(action.layerId);
+            } else {
+              applyExternalStyle(action.layerId, action.styleConfig);
+            }
+            break;
+          }
         }
       },
       [
+        applyExternalStyle,
         disposeChatJunctionRender,
         map,
+        resetExternalStyle,
         setActiveTools,
         setChatPanelFeatureInfos,
         setChatPanelTimeRange,
         setChatPanelType,
         setHighlightFeatures,
         setShowHistoryPanel,
+        setShowStyleEditor,
       ],
     ),
   );
diff --git a/src/store/chatToolStore.ts b/src/store/chatToolStore.ts
index 317ffa4..7a0e4d4 100644
--- a/src/store/chatToolStore.ts
+++ b/src/store/chatToolStore.ts
@@ -1,5 +1,7 @@
 import { create } from "zustand";
 
+import type { DefaultLayerStyleId, StyleConfig } from "@components/olmap/core/Controls/styleEditorTypes";
+
 /* ------------------------------------------------------------------ */
 /*  Chat Tool Action Store                                            */
 /*  Decouples chat tool calls from map/panel execution.               */
@@ -39,6 +41,12 @@ export type ChatToolAction =
       type: "render_junctions";
       renderRef: string;
       sessionId?: string;
+    }
+  | {
+      type: "apply_layer_style";
+      layerId: DefaultLayerStyleId;
+      resetToDefault: boolean;
+      styleConfig?: Partial<StyleConfig>;
     };
 
 interface ChatToolState {