diff --git a/backend/pick_student/pick_student.sqlite3 b/backend/pick_student/pick_student.sqlite3
deleted file mode 100644
index 5f08fdb..0000000
Binary files a/backend/pick_student/pick_student.sqlite3 and /dev/null differ
diff --git a/frontend/roll-book/src/views/ClassManagement.vue b/frontend/roll-book/src/views/ClassManagement.vue
index 5c87bff..a2b5d21 100644
--- a/frontend/roll-book/src/views/ClassManagement.vue
+++ b/frontend/roll-book/src/views/ClassManagement.vue
@@ -14,7 +14,7 @@
             <router-link to="/login">
                 <span class="quitLogin">退出</span>
             </router-link>
-            <span class="classCount">班级数 1</span>
+            <span class="classCount">班级数 {{ classes.length }}</span>
             <router-link to="/create_class">
                 <button class="createClass">+新建班级</button>
             </router-link>