diff --git a/src/main/services/chat-service.ts b/src/main/services/chat-service.ts
index 10c4686..13494b3 100644
--- a/src/main/services/chat-service.ts
+++ b/src/main/services/chat-service.ts
@@ -179,7 +179,9 @@ export function listContacts(filter?: string): FormattedContact[] {
 export async function listContactsAsync(filter?: string): Promise<FormattedContact[]> {
   if (!dbRef) return []
   await dbRef.getWcdb4Client().getSessionsAsync({
-    hydrateDisplayNames: false,
+    // macOS session rows frequently contain only wxid/chatroom ids. Hydrate
+    // contact display names before exposing the list to the renderer.
+    hydrateDisplayNames: true,
     hydrateStatuses: true
   })
   return listContacts(filter)
diff --git a/tests/unit/chat-service.test.ts b/tests/unit/chat-service.test.ts
new file mode 100644
index 0000000..a24409d
--- /dev/null
+++ b/tests/unit/chat-service.test.ts
@@ -0,0 +1,39 @@
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import type { WechatDb } from '../../src/main/wechat-db'
+import { listContactsAsync, setChatDb } from '../../src/main/services/chat-service'
+
+describe('chat service contacts', () => {
+  afterEach(() => setChatDb(null))
+
+  it('hydrates display names before returning macOS-style session ids', async () => {
+    const session = {
+      username: '57101206391@chatroom',
+      nickname: '57101206391@chatroom'
+    }
+    const getSessionsAsync = vi.fn(async (options: { hydrateDisplayNames?: boolean }) => {
+      if (options.hydrateDisplayNames) session.nickname = '测试群聊'
+      return [session]
+    })
+    const fakeDb = {
+      close: vi.fn(),
+      md5: () => 'fixture-md5',
+      getAllGroupContacts: () => ({ fixture: session.nickname }),
+      getUserList: () => [
+        {
+          m_nsUsrName: session.username,
+          nickname: session.nickname
+        }
+      ],
+      getWcdb4Client: () => ({ getSessionsAsync })
+    } as unknown as WechatDb
+
+    setChatDb(fakeDb)
+    const contacts = await listContactsAsync()
+
+    expect(getSessionsAsync).toHaveBeenCalledWith({
+      hydrateDisplayNames: true,
+      hydrateStatuses: true
+    })
+    expect(contacts[0]?.m_nsNickName).toBe('测试群聊')
+  })
+})