diff --git a/src/main/index.ts b/src/main/index.ts
index 55009e1..00f71f1 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -1,6 +1,6 @@
 import { app, BrowserWindow, dialog, ipcMain, shell } from "electron";
 import path from "node:path";
-import type { AppInfo, AppSettings, FlowDefinition } from "../shared/types";
+import type { AppInfo, AppSettings, FlowDefinition, FlowSaveOptions, FlowSaveResult } from "../shared/types";
 import { BrowserSession, hasBrowserSession, setBrowserElementWaitMs } from "./browser/session";
 import "./capabilities";
 import { catalogPath, loadCatalog } from "./catalog";
@@ -128,7 +128,15 @@ function registerIpc(): void {
     return listFlows();
   });
   ipcMain.handle("flows:get", (_event, id: string) => getFlow(id));
-  ipcMain.handle("flows:save", (_event, flow: FlowDefinition) => saveFlow(flow));
+  ipcMain.handle("flows:save", (_event, flow: FlowDefinition, opts?: FlowSaveOptions): FlowSaveResult => {
+  if (!opts?.force && opts?.expectedUpdatedAt) {
+    const disk = getFlow(flow.id);
+    if (disk && disk.meta?.updatedAt && disk.meta.updatedAt !== opts.expectedUpdatedAt) {
+      return { conflict: true, diskFlow: disk };
+    }
+  }
+  return { conflict: false, flow: saveFlow(flow) };
+});
   ipcMain.handle("flows:delete", (_event, id: string) => {
     deleteFlow(id);
     return true;
@@ -190,3 +198,5 @@ if (!gotLock) {
     void stopFixtureServer();
   });
 }
+
+
diff --git a/src/preload/index.ts b/src/preload/index.ts
index 956721a..07f71cf 100644
--- a/src/preload/index.ts
+++ b/src/preload/index.ts
@@ -1,5 +1,5 @@
 import { contextBridge, ipcRenderer } from "electron";
-import type { AppInfo, AppSettings, Catalog, FlowDefinition, FlowSummary, RunEvent } from "../shared/types";
+import type { AppInfo, AppSettings, Catalog, FlowDefinition, FlowSaveOptions, FlowSaveResult, FlowSummary, RunEvent } from "../shared/types";
 
 const api = {
   app: {
@@ -14,7 +14,7 @@ const api = {
     createDemo: (): Promise<FlowDefinition> => ipcRenderer.invoke("flows:create-demo"),
     createExamples: (): Promise<FlowSummary[]> => ipcRenderer.invoke("flows:create-examples"),
     get: (id: string): Promise<FlowDefinition> => ipcRenderer.invoke("flows:get", id),
-    save: (flow: FlowDefinition): Promise<FlowDefinition> => ipcRenderer.invoke("flows:save", flow),
+    save: (flow: FlowDefinition, opts?: FlowSaveOptions): Promise<FlowSaveResult> => ipcRenderer.invoke("flows:save", flow, opts),
     delete: (id: string): Promise<boolean> => ipcRenderer.invoke("flows:delete", id)
   },
   dialog: {
@@ -46,3 +46,4 @@ const api = {
 contextBridge.exposeInMainWorld("rpa", api);
 
 export type RpaApi = typeof api;
+
diff --git a/src/renderer/src/App.tsx b/src/renderer/src/App.tsx
index f2b298f..477f530 100644
--- a/src/renderer/src/App.tsx
+++ b/src/renderer/src/App.tsx
@@ -128,7 +128,7 @@ export function App() {
     try {
       const loaded = await window.rpa.flows.get(id);
       const flow = normalizeLegacyLinearLayout(loaded);
-      if (flow !== loaded) await window.rpa.flows.save(flow);
+      if (flow !== loaded) await window.rpa.flows.save(flow, { force: true });
       loadFlow(flow);
       setActiveFlowId(id);
       setPage("editor");
@@ -276,3 +276,4 @@ export function App() {
     </div>
   );
 }
+
diff --git a/src/renderer/src/pages/EditorPage.tsx b/src/renderer/src/pages/EditorPage.tsx
index 71ba6e3..b687909 100644
--- a/src/renderer/src/pages/EditorPage.tsx
+++ b/src/renderer/src/pages/EditorPage.tsx
@@ -25,6 +25,8 @@ export function EditorPage({ catalog, onToast, onBack }: EditorPageProps) {
   const redo = useEditorStore((state) => state.redo);
   const renameFlow = useEditorStore((state) => state.renameFlow);
   const markSaved = useEditorStore((state) => state.markSaved);
+  const loadFlow = useEditorStore((state) => state.loadFlow);
+  const syncSavedFlow = useEditorStore((state) => state.syncSavedFlow);
   const selectNode = useEditorStore((state) => state.selectNode);
   const canUndo = useEditorStore((state) => state.past.length > 0);
   const canRedo = useEditorStore((state) => state.future.length > 0);
@@ -32,29 +34,63 @@ export function EditorPage({ catalog, onToast, onBack }: EditorPageProps) {
   const startRun = useRunStore((state) => state.start);
   const stopRun = useRunStore((state) => state.stop);
   const [saving, setSaving] = useState(false);
+  const [saveConflict, setSaveConflict] = useState(false);
   const [savedAt, setSavedAt] = useState<string | null>(null);
   const [validationIssues, setValidationIssues] = useState<FlowValidationIssue[] | null>(null);
 
-  const save = useCallback(async () => {
+  const save = useCallback(async (opts?: { interactive?: boolean }) => {
     const current = useEditorStore.getState().flow;
-    if (!current || saving) return;
+    if (!current || saving) return null;
     setSaving(true);
     try {
-      await window.rpa.flows.save(current);
+      const result = await window.rpa.flows.save(current, {
+        expectedUpdatedAt: current.meta?.updatedAt || undefined
+      });
+      if (result.conflict) {
+        if (opts?.interactive) {
+          const loadDisk = window.confirm(
+            "任务已在磁盘上被外部修改（可能被其他工具保存过）。\n\n" +
+              "「确定」加载磁盘上的最新版本（放弃当前编辑）\n" +
+              "「取消」以当前编辑内容覆盖磁盘"
+          );
+          if (loadDisk) {
+            loadFlow(result.diskFlow);
+            markSaved();
+            setSaveConflict(false);
+            onToast("已加载磁盘上的最新版本");
+            return null;
+          }
+          const forced = await window.rpa.flows.save(current, { force: true });
+          if (forced.conflict) return null;
+          syncSavedFlow(forced.flow);
+          markSaved();
+          setSaveConflict(false);
+          setSavedAt(new Date().toLocaleTimeString("zh-CN", { hour: "2-digit", minute: "2-digit" }));
+          onToast("已覆盖磁盘上的旧版本");
+          return forced.flow;
+        }
+        onToast("检测到磁盘上的任务已被外部修改，自动保存已暂停；请按 Ctrl+S 处理", "error");
+        setSaveConflict(true);
+        return null;
+      }
+      syncSavedFlow(result.flow);
       markSaved();
+      setSaveConflict(false);
       setSavedAt(new Date().toLocaleTimeString("zh-CN", { hour: "2-digit", minute: "2-digit" }));
+      return result.flow;
     } catch (error) {
       onToast(error instanceof Error ? error.message : String(error), "error");
+      return null;
     } finally {
       setSaving(false);
     }
-  }, [markSaved, onToast, saving]);
+  }, [loadFlow, markSaved, onToast, saving, syncSavedFlow]);
 
   useEffect(() => {
-    if (!dirty) return;
+    if (!dirty || saveConflict) return;
     const timer = window.setTimeout(() => void save(), 900);
     return () => window.clearTimeout(timer);
-  }, [dirty, flow, save]);
+  }, [dirty, flow, save, saveConflict]);
 
   useEffect(() => {
     const handler = (event: KeyboardEvent) => {
@@ -62,7 +98,7 @@ export function EditorPage({ catalog, onToast, onBack }: EditorPageProps) {
       if (!mod) return;
       if (event.key.toLowerCase() === "s") {
         event.preventDefault();
-        void save();
+        void save({ interactive: true });
       } else if (event.key.toLowerCase() === "z" && !event.shiftKey) {
         event.preventDefault();
         undo();
@@ -76,16 +112,10 @@ export function EditorPage({ catalog, onToast, onBack }: EditorPageProps) {
   }, [redo, save, undo]);
 
   const executeCurrentFlow = useCallback(async () => {
-    const current = useEditorStore.getState().flow;
-    if (!current) return;
-    try {
-      const saved = await window.rpa.flows.save(current);
-      markSaved();
-      await startRun(saved);
-    } catch (error) {
-      onToast(error instanceof Error ? error.message : String(error), "error");
-    }
-  }, [markSaved, onToast, startRun]);
+    const saved = await save({ interactive: true });
+    if (!saved) return;
+    await startRun(saved);
+  }, [save, startRun]);
 
   const runCurrentFlow = useCallback(async () => {
     const current = useEditorStore.getState().flow;
@@ -218,3 +248,4 @@ export function EditorPage({ catalog, onToast, onBack }: EditorPageProps) {
     </div>
   );
 }
+
diff --git a/src/renderer/src/store/editorStore.ts b/src/renderer/src/store/editorStore.ts
index 4b34c84..7fc31d4 100644
--- a/src/renderer/src/store/editorStore.ts
+++ b/src/renderer/src/store/editorStore.ts
@@ -81,6 +81,8 @@ interface EditorState {
   undo: () => void;
   redo: () => void;
   markSaved: () => void;
+  /** 保存成功后用服务端返回的流程同步内存（刷新 updatedAt 基准），不触发 dirty */
+  syncSavedFlow: (flow: FlowDefinition) => void;
   reset: () => void;
 }
 
@@ -332,7 +334,9 @@ export const useEditorStore = create<EditorState>((set, get) => {
     },
 
     markSaved: () => set({ dirty: false }),
+    syncSavedFlow: (flow) => set({ flow, dirty: false }),
 
     reset: () => set({ flow: null, selectedNodeId: null, dirty: false, past: [], future: [] })
   };
 });
+
diff --git a/src/shared/types.ts b/src/shared/types.ts
index b0a7900..55b384c 100644
--- a/src/shared/types.ts
+++ b/src/shared/types.ts
@@ -145,6 +145,16 @@ export interface FlowDefinition {
   };
 }
 
+export interface FlowSaveOptions {
+  /** 编辑器加载任务时磁盘上的 updatedAt，用于外部修改冲突检测 */
+  expectedUpdatedAt?: string;
+  /** 为 true 时跳过冲突检测，强制覆盖磁盘 */
+  force?: boolean;
+}
+
+export type FlowSaveResult =
+  | { conflict: false; flow: FlowDefinition }
+  | { conflict: true; diskFlow: FlowDefinition };
 export interface FlowSummary {
   id: string;
   name: string;
@@ -230,3 +240,4 @@ export interface RunEvent {
   attempt?: number;
   startedAt?: string;
 }
+