diff --git a/src/components/FormFields/ProtocolSelector/index.vue b/src/components/FormFields/ProtocolSelector/index.vue
index e1780429f..f33118657 100644
--- a/src/components/FormFields/ProtocolSelector/index.vue
+++ b/src/components/FormFields/ProtocolSelector/index.vue
@@ -12,12 +12,9 @@
           slot="prepend"
           :disabled="disableSelect(item)"
           :value="item.display_name ? item.display_name : item.name"
-          class="prepend auto-width-select"
+          class="prepend"
           @change="handleProtocolChange($event, item)"
         >
-          <template slot="prefix">
-            {{ item.display_name ? item.display_name : item.name }}
-          </template>
           <el-option
             v-for="p of remainProtocols"
             :key="p.name"
@@ -270,11 +267,15 @@ export default {
   }
 }
 </script>
-<style lang="scss" scoped>
+<style lang="less" scoped>
 .el-select .el-input {
   width: 130px;
 }
 
+.el-select {
+  max-width: 120px;
+}
+
 .input-with-select {
   flex-shrink: 1;
   width: calc(100% - 80px) !important;
@@ -309,30 +310,4 @@ export default {
   color: #1a1a1a;
   padding: 9px 20px;
 }
-
-.auto-width-select > .el-input--prefix {
-  min-width: 120px!important;
-}
-
-.auto-width-select >>> .el-input__prefix {
-    position: relative;
-    left: 0px;
-    padding: 0 30px;
-    box-sizing: border-box;
-    height: 34px;
-    line-height: 34px;
-    visibility: hidden;
-}
-
-.auto-width-select >>> input {
-  position: absolute!important;
-  width: 100%!important;
-  border: none;
-  color: #606266;
-  background-color: #e6e6e6;
-  font-size: 12px;
-  font-weight: 470;
-  line-height: 27px;
-}
-
 </style>