diff --git a/e2e/scada-history-zoom.spec.ts b/e2e/scada-history-zoom.spec.ts
new file mode 100644
index 0000000..b6a7fee
--- /dev/null
+++ b/e2e/scada-history-zoom.spec.ts
@@ -0,0 +1,63 @@
+import { expect, test } from "@playwright/test";
+
+import { mockBackend } from "./support/mockBackend";
+
+test("地图缩放不会重新请求已打开的 SCADA 历史数据", async ({ page }) => {
+  await mockBackend(page);
+
+  await page.route("**/ows?**", (route) =>
+    route.fulfill({
+      contentType: "application/json",
+      body: JSON.stringify({
+        type: "FeatureCollection",
+        features: [
+          {
+            type: "Feature",
+            id: "S-1",
+            properties: {
+              id: "S-1",
+              device_type: "pressure",
+              reliability: 0.95,
+              transmission_frequency: "00:15:00",
+            },
+            geometry: { type: "Point", coordinates: [13530000, 3620000] },
+          },
+        ],
+      }),
+    }),
+  );
+  await page.route("**/api/v1/scada-devices", (route) =>
+    route.fulfill({
+      contentType: "application/json",
+      body: JSON.stringify([
+        { device_id: "S-1", device_type: "pressure", node_id: "J-1", link_id: null },
+      ]),
+    }),
+  );
+
+  let historyRequests = 0;
+  await page.route("**/api/v1/timeseries/views/element-history/query", (route) => {
+    historyRequests += 1;
+    return route.fulfill({
+      contentType: "application/json",
+      body: JSON.stringify({ series: [] }),
+    });
+  });
+
+  await page.goto("/network-simulation");
+  await page.getByText("S-1", { exact: true }).click();
+  await expect(page.getByText("SCADA 历史数据")).toBeVisible();
+  await expect.poll(() => historyRequests).toBe(1);
+
+  const zoomLabel = page.getByText(/缩放: \d+\.\d/);
+  const initialZoom = await zoomLabel.textContent();
+  // The history drawer covers the map controls. Invoke their real handlers
+  // without targeting a covered screen coordinate.
+  await page.getByRole("button", { name: "放大" }).evaluate((button: HTMLButtonElement) => button.click());
+  await expect(zoomLabel).not.toHaveText(initialZoom!);
+  expect(historyRequests).toBe(1);
+
+  await page.getByRole("button", { name: "缩小" }).evaluate((button: HTMLButtonElement) => button.click());
+  await expect(zoomLabel).toHaveText(initialZoom!);
+  expect(historyRequests).toBe(1);
+});
diff --git a/src/components/olmap/SCADA/SCADADataPanel.test.tsx b/src/components/olmap/SCADA/SCADADataPanel.test.tsx
new file mode 100644
index 0000000..2515a77
--- /dev/null
+++ b/src/components/olmap/SCADA/SCADADataPanel.test.tsx
@@ -0,0 +1,50 @@
+import { fireEvent, render, screen, waitFor } from "@testing-library/react";
+
+import { apiFetch } from "@/lib/apiFetch";
+import SCADADataPanel from "./SCADADataPanel";
+
+jest.mock("@/lib/apiFetch", () => ({ apiFetch: jest.fn() }));
+jest.mock("@refinedev/core", () => ({
+  useGetIdentity: () => ({ data: { id: "test-user" } }),
+  useNotification: () => ({ open: jest.fn() }),
+}));
+jest.mock("@mui/x-date-pickers", () => ({
+  DateTimePicker: () => null,
+  LocalizationProvider: ({ children }: { children: React.ReactNode }) => children,
+}));
+jest.mock("echarts-for-react", () => () => null);
+
+const response = (payload: unknown) =>
+  ({ ok: true, json: async () => payload }) as Response;
+
+describe("SCADADataPanel requests", () => {
+  beforeEach(() => {
+    jest.mocked(apiFetch).mockImplementation(async (url) =>
+      response(
+        String(url).includes("/scada-devices")
+          ? [
+              { device_id: "S-1", device_type: "pressure", node_id: "J-1", link_id: null },
+              { device_id: "S-2", device_type: "pressure", node_id: "J-2", link_id: null },
+            ]
+          : { series: [] },
+      ),
+    );
+  });
+
+  afterEach(() => jest.clearAllMocks());
+
+  it("does not request history again when the same device IDs arrive in a new array", async () => {
+    const { rerender } = render(<SCADADataPanel deviceIds={["S-1"]} />);
+    await waitFor(() => expect(apiFetch).toHaveBeenCalledTimes(2));
+
+    rerender(<SCADADataPanel deviceIds={["S-1"]} />);
+    await waitFor(() => expect(apiFetch).toHaveBeenCalledTimes(2));
+
+    rerender(<SCADADataPanel deviceIds={["S-1", "S-2"]} />);
+    await waitFor(() => expect(apiFetch).toHaveBeenCalledTimes(4));
+    expect(jest.mocked(apiFetch).mock.calls[3][1]?.body).toContain('"device_ids":["S-2"]');
+
+    fireEvent.click(screen.getByRole("button", { name: "刷新" }));
+    await waitFor(() => expect(apiFetch).toHaveBeenCalledTimes(6));
+  });
+});
diff --git a/src/components/olmap/SCADA/SCADADataPanel.tsx b/src/components/olmap/SCADA/SCADADataPanel.tsx
index 4f8fb02..920e4c4 100644
--- a/src/components/olmap/SCADA/SCADADataPanel.tsx
+++ b/src/components/olmap/SCADA/SCADADataPanel.tsx
@@ -307,9 +307,15 @@ const SCADADataPanel: React.FC<SCADADataPanelProps> = ({
 
   const normalizedRange = useMemo(() => ensureValidRange(from, to), [from, to]);
 
-  const hasDevices = deviceIds.length > 0;
+  // Parent map updates can pass a new array with identical IDs. Keep the
+  // request dependency tied to the IDs themselves, not the array identity.
+  const deviceIdsKey = JSON.stringify(deviceIds);
+  const requestedDeviceIds = useMemo(
+    () => JSON.parse(deviceIdsKey) as string[],
+    [deviceIdsKey],
+  );
+  const hasDevices = requestedDeviceIds.length > 0;
   const hasData = timeSeries.length > 0;
-  const deviceIdsKey = useMemo(() => deviceIds.join(","), [deviceIds]);
 
   const dataset = useMemo(
     () => buildDataset(timeSeries, deviceIds, fractionDigits, showCleaning),
@@ -348,7 +354,7 @@ const SCADADataPanel: React.FC<SCADADataPanelProps> = ({
       setError(null);
       try {
         const { from: rangeFrom, to: rangeTo } = normalizedRange;
-        const result = await customFetcher(deviceIds, {
+        const result = await customFetcher(requestedDeviceIds, {
           from: rangeFrom.toDate(),
           to: rangeTo.toDate(),
         });
@@ -360,7 +366,7 @@ const SCADADataPanel: React.FC<SCADADataPanelProps> = ({
         setLoadingState("error");
       }
     },
-    [deviceIds, customFetcher, hasDevices, normalizedRange],
+    [requestedDeviceIds, customFetcher, hasDevices, normalizedRange],
   );
 
   // 处理数据清洗
@@ -447,7 +453,7 @@ const SCADADataPanel: React.FC<SCADADataPanelProps> = ({
       setTimeSeries([]);
       setHistorySeries([]);
     }
-  }, [deviceIdsKey, handleFetch, hasDevices]);
+  }, [handleFetch, hasDevices]);
 
   // 当设备数量变化时，调整数据源选择
   useEffect(() => {
diff --git a/src/components/olmap/core/Controls/HistoryDataPanel.test.ts b/src/components/olmap/core/Controls/HistoryDataPanel.test.ts
index f96b81b..e5e3f79 100644
--- a/src/components/olmap/core/Controls/HistoryDataPanel.test.ts
+++ b/src/components/olmap/core/Controls/HistoryDataPanel.test.ts
@@ -1,5 +1,7 @@
+import React from "react";
+import { render, waitFor } from "@testing-library/react";
 import { apiFetch } from "@/lib/apiFetch";
-import { fetchHistoryData } from "./HistoryDataPanel";
+import HistoryDataPanel, { fetchHistoryData } from "./HistoryDataPanel";
 
 jest.mock("@/lib/apiFetch", () => ({
   apiFetch: jest.fn(),
@@ -9,6 +11,12 @@ jest.mock("@components/olmap/core/MapComponent", () => ({
   useData: () => null,
 }));
 
+jest.mock("@mui/x-date-pickers", () => ({
+  DateTimePicker: () => null,
+  LocalizationProvider: ({ children }: { children: React.ReactNode }) => children,
+}));
+jest.mock("echarts-for-react", () => () => null);
+
 const jsonResponse = (payload: unknown, status = 200) =>
   ({
     ok: status >= 200 && status < 300,
@@ -94,3 +102,39 @@ describe("fetchHistoryData", () => {
     expect(apiFetch).toHaveBeenCalledTimes(1);
   });
 });
+
+describe("HistoryDataPanel requests", () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+    jest.mocked(apiFetch).mockResolvedValue(jsonResponse({ series: [] }));
+  });
+
+  afterEach(() => jest.clearAllMocks());
+
+  it("does not reload unchanged elements when its parent rerenders", async () => {
+    const props = { type: "none" as const, onClose: jest.fn() };
+    const { rerender } = render(
+      React.createElement(HistoryDataPanel, {
+        ...props,
+        featureInfos: [["J-1", "junction"]],
+      }),
+    );
+    await waitFor(() => expect(apiFetch).toHaveBeenCalledTimes(1));
+
+    rerender(
+      React.createElement(HistoryDataPanel, {
+        ...props,
+        featureInfos: [["J-1", "junction"]],
+      }),
+    );
+    await waitFor(() => expect(apiFetch).toHaveBeenCalledTimes(1));
+
+    rerender(
+      React.createElement(HistoryDataPanel, {
+        ...props,
+        featureInfos: [["J-2", "junction"]],
+      }),
+    );
+    await waitFor(() => expect(apiFetch).toHaveBeenCalledTimes(2));
+  });
+});
diff --git a/src/components/olmap/core/Controls/HistoryDataPanel.tsx b/src/components/olmap/core/Controls/HistoryDataPanel.tsx
index 83c2b8e..26bacdf 100644
--- a/src/components/olmap/core/Controls/HistoryDataPanel.tsx
+++ b/src/components/olmap/core/Controls/HistoryDataPanel.tsx
@@ -258,12 +258,13 @@ const SCADADataPanel: React.FC<SCADADataPanelProps> = ({
 
   const normalizedRange = useMemo(() => ensureValidRange(from, to), [from, to]);
 
-  const hasDevices = deviceIds.length > 0;
-  const hasData = timeSeries.length > 0;
-  const featureInfosKey = useMemo(
-    () => JSON.stringify(featureInfos),
-    [featureInfos]
+  const featureInfosKey = JSON.stringify(featureInfos);
+  const requestedFeatureInfos = useMemo(
+    () => JSON.parse(featureInfosKey) as [string, string][],
+    [featureInfosKey],
   );
+  const hasDevices = requestedFeatureInfos.length > 0;
+  const hasData = timeSeries.length > 0;
 
   const dataset = useMemo(
     () => buildDataset(timeSeries, historySeries, fractionDigits),
@@ -289,7 +290,7 @@ const SCADADataPanel: React.FC<SCADADataPanelProps> = ({
       try {
         const { from: rangeFrom, to: rangeTo } = normalizedRange;
         const result = await fetchHistoryData(
-          featureInfos,
+          requestedFeatureInfos,
           {
             from: rangeFrom.toDate(),
             to: rangeTo.toDate(),
@@ -313,7 +314,7 @@ const SCADADataPanel: React.FC<SCADADataPanelProps> = ({
         setLoadingState("error");
       }
     },
-    [featureInfos, hasDevices, normalizedRange, runId, type],
+    [requestedFeatureInfos, hasDevices, normalizedRange, runId, type],
   );
 
   useEffect(
@@ -331,7 +332,7 @@ const SCADADataPanel: React.FC<SCADADataPanelProps> = ({
       setTimeSeries([]);
       setHistorySeries([]);
     }
-  }, [featureInfosKey, handleFetch, hasDevices]);
+  }, [handleFetch, hasDevices]);
 
   const columns: GridColDef[] = useMemo(() => {
     const base: GridColDef[] = [