diff --git a/src/server/__tests__/sessions.test.ts b/src/server/__tests__/sessions.test.ts
index 8b341590..cfb77ba1 100644
--- a/src/server/__tests__/sessions.test.ts
+++ b/src/server/__tests__/sessions.test.ts
@@ -2022,7 +2022,7 @@ describe('Sessions API', () => {
           branch: string | null
         } | null
       }
-      expect(body.branch).toBe('main')
+      expect(body.branch).toBe(repository!.worktreeBranch)
       expect(body.workDir).toBe(activeWorktree)
       expect(body.worktree).toEqual({
         enabled: true,
@@ -2067,7 +2067,7 @@ describe('Sessions API', () => {
         branch: string | null
       } | null
     }
-    expect(body.branch).toBe('main')
+    expect(body.branch).toBe('worktree-desktop-main-12345678')
     expect(body.workDir).toBe(activeWorktree)
     expect(body.worktree).toEqual({
       enabled: true,
@@ -2121,7 +2121,7 @@ describe('Sessions API', () => {
         branch: string | null
       } | null
     }
-    expect(body.branch).toBe('main')
+    expect(body.branch).toBe('worktree-desktop-main-12345678')
     expect(body.worktree).toMatchObject({
       path: activeWorktree,
       plannedPath: activeWorktree,
diff --git a/src/server/api/sessions.ts b/src/server/api/sessions.ts
index 51d9e375..c1bff8c9 100644
--- a/src/server/api/sessions.ts
+++ b/src/server/api/sessions.ts
@@ -15,6 +15,7 @@
  *   PATCH  /api/sessions/:id        — 重命名会话
  */
 
+import * as path from 'node:path'
 import { sessionService } from '../services/sessionService.js'
 import { conversationService } from '../services/conversationService.js'
 import { ApiError, errorResponse } from '../middleware/errorHandler.js'
@@ -622,6 +623,11 @@ function chooseRicherUsage(
     : currentUsage
 }
 
+function sameResolvedPath(left: string | null | undefined, right: string | null | undefined): boolean {
+  if (!left || !right) return false
+  return path.resolve(left) === path.resolve(right)
+}
+
 async function getGitInfo(sessionId: string): Promise<Response> {
   const workDir = conversationService.getSessionWorkDir(sessionId) || await sessionService.getSessionWorkDir(sessionId)
   if (!workDir) {
@@ -653,7 +659,14 @@ async function getGitInfo(sessionId: string): Promise<Response> {
       stderr: 'pipe',
     })
     const branchText = await new Response(branchProc.stdout).text()
-    const branch = sessionBranch || branchText.trim()
+    const gitBranch = branchText.trim() || null
+    const materializedWorktree = !!worktree && (
+      sameResolvedPath(workDir, worktree.path) ||
+      sameResolvedPath(workDir, worktree.plannedPath)
+    )
+    const branch = materializedWorktree
+      ? (gitBranch || worktree.branch || sessionBranch)
+      : (sessionBranch || gitBranch)
 
     // Get repo name from remote or directory
     let repoName = ''