diff --git a/src/main/java/com/g9/g9backend/controller/UserController.java b/src/main/java/com/g9/g9backend/controller/UserController.java
index 7daf5f3..49dbd21 100644
--- a/src/main/java/com/g9/g9backend/controller/UserController.java
+++ b/src/main/java/com/g9/g9backend/controller/UserController.java
@@ -83,7 +83,7 @@
         if (userCheck != null) {
             // 用户名重复
             logger.warn("Registration attempt failed. Account already exists: {}", username);
-            return ResponseEntity.status(407).body("");
+            return ResponseEntity.status(412).body("");
         }
 
         // 查询邀请码是否存在
diff --git a/src/test/java/com/g9/g9backend/controller/UserControllerTest.java b/src/test/java/com/g9/g9backend/controller/UserControllerTest.java
index 76db7ee..bb768a0 100644
--- a/src/test/java/com/g9/g9backend/controller/UserControllerTest.java
+++ b/src/test/java/com/g9/g9backend/controller/UserControllerTest.java
@@ -113,7 +113,7 @@
         mockMvc.perform(post("/user/register")
                         .contentType(MediaType.APPLICATION_JSON)
                         .content(objectMapper.writeValueAsString(new RegisterDTO("hcy", "123", "6RCA7Y8J"))))
-                .andExpect(status().is(407));
+                .andExpect(status().is(412));
     }
 
     @Test