diff --git a/docs/internal/ServiceIPC.md b/docs/internal/ServiceIPC.md
new file mode 100644
index 00000000..3d3c765e
--- /dev/null
+++ b/docs/internal/ServiceIPC.md
@@ -0,0 +1,7 @@
+# Service IPC
+
+## Sync service
+
+Some services are sync, like `getSubWorkspacesAsListSync` `getActiveWorkspaceSync` from `src/services/workspaces/index.ts`, they can't be called from renderer, only can be used in the main process.
+
+Because after pass through IPC, everything will be async, so its function typescript signature will be wrong.
diff --git a/src/services/workspaces/getWorkspaceMenuTemplate.ts b/src/services/workspaces/getWorkspaceMenuTemplate.ts
index 98a8549c..5c76f766 100644
--- a/src/services/workspaces/getWorkspaceMenuTemplate.ts
+++ b/src/services/workspaces/getWorkspaceMenuTemplate.ts
@@ -23,7 +23,7 @@ interface IWorkspaceMenuRequiredServices {
   wiki: Pick<IWikiService, 'wikiOperation' | 'requestWikiSendActionMessage'>;
   wikiGitWorkspace: Pick<IWikiGitWorkspaceService, 'removeWorkspace'>;
   window: Pick<IWindowService, 'open'>;
-  workspace: Pick<IWorkspaceService, 'getActiveWorkspace' | 'getSubWorkspacesAsListSync'>;
+  workspace: Pick<IWorkspaceService, 'getActiveWorkspace' | 'getSubWorkspacesAsList'>;
   workspaceView: Pick<
     IWorkspaceViewService,
     | 'wakeUpWorkspaceView'
@@ -129,7 +129,8 @@ export async function getWorkspaceMenuTemplate(
           } else {
             // sync all sub workspace
             const mainHasChanges = await service.git.commitAndSync(workspace, { remoteUrl: gitUrl, userInfo });
-            const subHasChangesPromise = service.workspace.getSubWorkspacesAsListSync(id).map(async (workspace) => {
+            const subWorkspaces = await service.workspace.getSubWorkspacesAsList(id);
+            const subHasChangesPromise = subWorkspaces.map(async (workspace) => {
               const hasChanges = await service.git.commitAndSync(workspace, { remoteUrl: gitUrl, userInfo });
               return hasChanges;
             });
diff --git a/src/services/workspaces/index.ts b/src/services/workspaces/index.ts
index 14cf4f05..de3ffece 100644
--- a/src/services/workspaces/index.ts
+++ b/src/services/workspaces/index.ts
@@ -220,6 +220,13 @@ export class Workspace implements IWorkspaceService {
     return Object.values(this.workspaces).sort(workspaceSorter);
   }
 
+  public async getSubWorkspacesAsList(workspaceID: string): Promise<IWorkspace[]> {
+    const workspace = this.getSync(workspaceID);
+    if (workspace === undefined) return [];
+    if (workspace.isSubWiki) return [];
+    return this.getWorkspacesAsListSync().filter((w) => w.mainWikiID === workspaceID).sort(workspaceSorter);
+  }
+
   public getSubWorkspacesAsListSync(workspaceID: string): IWorkspace[] {
     const workspace = this.getSync(workspaceID);
     if (workspace === undefined) return [];
diff --git a/src/services/workspaces/interface.ts b/src/services/workspaces/interface.ts
index d6cf26c6..c6145b56 100644
--- a/src/services/workspaces/interface.ts
+++ b/src/services/workspaces/interface.ts
@@ -181,6 +181,10 @@ export interface IWorkspaceService {
   getMetaData: (id: string) => Promise<Partial<IWorkspaceMetaData>>;
   getNextWorkspace: (id: string) => Promise<IWorkspace | undefined>;
   getPreviousWorkspace: (id: string) => Promise<IWorkspace | undefined>;
+  getSubWorkspacesAsList(workspaceID: string): Promise<IWorkspace[]>;
+  /**
+   * Only meant to be used in TidGi's services internally.
+   */
   getSubWorkspacesAsListSync(workspaceID: string): IWorkspace[];
   getWorkspaces(): Promise<Record<string, IWorkspace>>;
   getWorkspacesAsList(): Promise<IWorkspace[]>;