diff --git a/video-gen-api/app/api/v1/auth.py b/video-gen-api/app/api/v1/auth.py
index 0a16d8cb..cbee25c5 100644
--- a/video-gen-api/app/api/v1/auth.py
+++ b/video-gen-api/app/api/v1/auth.py
@@ -15,6 +15,7 @@ from app.models.system_config import SystemConfig
 from app.models.user import User
 from app.schemas.auth import (
     ChangePasswordRequest,
+    ChangeUsernameRequest,
     LoginRequest,
     RegisterRequest,
     SetPasswordRequest,
@@ -323,6 +324,17 @@ async def change_password(
     return {"message": "密码修改成功"}
 
 
+@router.post("/change-username")
+async def change_username(
+    req: ChangeUsernameRequest,
+    current_user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
+    current_user.username = req.new_username.strip()
+    await db.flush()
+    return {"message": "用户名修改成功"}
+
+
 @router.get("/site-info")
 async def get_site_info(db: AsyncSession = Depends(get_db)):
     """Public endpoint returning site name, logo, agreement and copyright info."""
diff --git a/video-gen-api/app/schemas/auth.py b/video-gen-api/app/schemas/auth.py
index 1187765c..e1e729b3 100644
--- a/video-gen-api/app/schemas/auth.py
+++ b/video-gen-api/app/schemas/auth.py
@@ -28,6 +28,10 @@ class ChangePasswordRequest(BaseModel):
     new_password: str = Field(..., min_length=6, description="新密码，至少6位")
 
 
+class ChangeUsernameRequest(BaseModel):
+    new_username: str = Field(..., min_length=1, max_length=10, description="新用户名，1-10位")
+
+
 class TokenResponse(BaseModel):
     access_token: str
     token_type: str = "bearer"