diff --git a/src/layout/components/AppHeader.vue b/src/layout/components/AppHeader.vue
index dbc4dbd..f99617d 100644
--- a/src/layout/components/AppHeader.vue
+++ b/src/layout/components/AppHeader.vue
@@ -2,7 +2,7 @@
   <el-header class="app-header">
     <h3>{{ title }}</h3>
     <!--子系统选项-->
-    <el-dropdown class="systemSelect" @command="handleCommand">
+    <el-dropdown class="systemSelect" size="medium" @command="handleCommand">
       <span class="el-dropdown-link">{{ currentSystem.name }}<i class="el-icon-arrow-down el-icon--right"/>
       </span>
       <el-dropdown-menu slot="dropdown">