diff --git a/src/components/olmap/BurstSimulation/SchemeQuery.tsx b/src/components/olmap/BurstSimulation/SchemeQuery.tsx
index a92d6b1..67082b0 100644
--- a/src/components/olmap/BurstSimulation/SchemeQuery.tsx
+++ b/src/components/olmap/BurstSimulation/SchemeQuery.tsx
@@ -51,6 +51,10 @@ import { Point } from "ol/geom";
 import { toLonLat } from "ol/proj";
 import Timeline from "@components/olmap/core/Controls/Timeline";
 import { SchemaItem, SchemeRecord } from "./types";
+import {
+  getPipeDiameterDisplay,
+  type PipeDiameterMap,
+} from "./schemePipeDiameters";
 
 interface SchemeQueryProps {
   schemes?: SchemeRecord[];
@@ -109,6 +113,12 @@ const SchemeQuery: React.FC<SchemeQueryProps> = ({
   const [internalSchemes, setInternalSchemes] = useState<SchemeRecord[]>([]);
   const [loading, setLoading] = useState<boolean>(false);
   const [mapContainer, setMapContainer] = useState<HTMLElement | null>(null); // 地图容器元素
+  const [pipeDiametersByScheme, setPipeDiametersByScheme] = useState<
+    Record<number, PipeDiameterMap>
+  >({});
+  const [loadingDiameterByScheme, setLoadingDiameterByScheme] = useState<
+    Record<number, boolean>
+  >({});
 
   const { open } = useNotification();
 
@@ -209,6 +219,80 @@ const SchemeQuery: React.FC<SchemeQueryProps> = ({
     }
   };
 
+  useEffect(() => {
+    if (expandedId === null || pipeDiametersByScheme[expandedId]) {
+      return;
+    }
+
+    const scheme = filteredSchemes.find((scheme) => scheme.id === expandedId);
+    const pipeIds = scheme?.schemeDetail?.burst_ID ?? [];
+    if (pipeIds.length === 0) {
+      return;
+    }
+
+    let cancelled = false;
+    setLoadingDiameterByScheme((previous) => ({
+      ...previous,
+      [expandedId]: true,
+    }));
+
+    const loadPipeDiameters = async () => {
+      let features = await queryFeaturesByIds(pipeIds, "geo_pipes_mat");
+      const foundPipeIds = new Set(
+        features.map((feature) => String(feature.getProperties().id)),
+      );
+      const missingPipeIds = pipeIds.filter(
+        (pipeId) => !foundPipeIds.has(pipeId),
+      );
+
+      if (missingPipeIds.length > 0) {
+        const fallbackFeatures = await queryFeaturesByIds(
+          missingPipeIds,
+          "geo_pipes",
+        );
+        features = [...features, ...fallbackFeatures];
+      }
+
+      const nextDiameters: PipeDiameterMap = Object.fromEntries(
+        pipeIds.map((pipeId) => [pipeId, null]),
+      );
+
+      features.forEach((feature) => {
+        const properties = feature.getProperties();
+        const pipeId = String(properties.id);
+        const diameter = Number(properties.diameter);
+        nextDiameters[pipeId] = Number.isFinite(diameter) ? diameter : null;
+      });
+
+      if (cancelled) {
+        return;
+      }
+
+      setPipeDiametersByScheme((previous) => ({
+        ...previous,
+        [expandedId]: nextDiameters,
+      }));
+      setLoadingDiameterByScheme((previous) => ({
+        ...previous,
+        [expandedId]: false,
+      }));
+    };
+
+    loadPipeDiameters().catch((error) => {
+      console.error("查询管径失败:", error);
+      if (!cancelled) {
+        setLoadingDiameterByScheme((previous) => ({
+          ...previous,
+          [expandedId]: false,
+        }));
+      }
+    });
+
+    return () => {
+      cancelled = true;
+    };
+  }, [expandedId, filteredSchemes, pipeDiametersByScheme]);
+
   // 内部的方案查询函数
   const handleViewDetails = (id: number) => {
     const scheme = filteredSchemes.find((s) => s.id === id);
@@ -568,7 +652,11 @@ const SchemeQuery: React.FC<SchemeQueryProps> = ({
                                   variant="caption"
                                   className="font-medium text-gray-900"
                                 >
-                                  560 mm
+                                  {getPipeDiameterDisplay(
+                                    scheme.schemeDetail?.burst_ID,
+                                    pipeDiametersByScheme[scheme.id],
+                                    !!loadingDiameterByScheme[scheme.id],
+                                  )}
                                 </Typography>
                               </Box>
                               <Box className="flex items-center gap-2">
diff --git a/src/components/olmap/BurstSimulation/schemePipeDiameters.test.ts b/src/components/olmap/BurstSimulation/schemePipeDiameters.test.ts
new file mode 100644
index 0000000..7ee83bd
--- /dev/null
+++ b/src/components/olmap/BurstSimulation/schemePipeDiameters.test.ts
@@ -0,0 +1,20 @@
+import { getPipeDiameterDisplay } from "./schemePipeDiameters";
+
+describe("getPipeDiameterDisplay", () => {
+  it("shows the actual diameter for one burst pipe", () => {
+    expect(getPipeDiameterDisplay(["P-1"], { "P-1": 315 })).toBe("315 mm");
+  });
+
+  it("shows pipe IDs with diameters for multiple burst pipes", () => {
+    expect(
+      getPipeDiameterDisplay(["P-1", "P-2"], {
+        "P-1": 315,
+        "P-2": 800,
+      }),
+    ).toBe("P-1: 315 mm；P-2: 800 mm");
+  });
+
+  it("does not fall back to a fixed diameter when a diameter is missing", () => {
+    expect(getPipeDiameterDisplay(["P-1"], {})).toBe("N/A");
+  });
+});
diff --git a/src/components/olmap/BurstSimulation/schemePipeDiameters.ts b/src/components/olmap/BurstSimulation/schemePipeDiameters.ts
new file mode 100644
index 0000000..69d2af6
--- /dev/null
+++ b/src/components/olmap/BurstSimulation/schemePipeDiameters.ts
@@ -0,0 +1,27 @@
+export type PipeDiameterMap = Record<string, number | null | undefined>;
+
+export const getPipeDiameterDisplay = (
+  pipeIds: string[] | undefined,
+  diameters: PipeDiameterMap | undefined,
+  loading = false,
+): string => {
+  if (loading) {
+    return "查询中...";
+  }
+
+  if (!pipeIds?.length) {
+    return "N/A";
+  }
+
+  const values = pipeIds.map((pipeId) => {
+    const diameter = diameters?.[pipeId];
+    const displayValue =
+      typeof diameter === "number" && Number.isFinite(diameter)
+        ? `${diameter} mm`
+        : "N/A";
+
+    return pipeIds.length === 1 ? displayValue : `${pipeId}: ${displayValue}`;
+  });
+
+  return values.join("；");
+};