diff --git a/src/components/SelectTree/singleSelect.vue b/src/components/SelectTree/singleSelect.vue
index 7cc7b49..d4f6dad 100644
--- a/src/components/SelectTree/singleSelect.vue
+++ b/src/components/SelectTree/singleSelect.vue
@@ -15,6 +15,7 @@
       :expand-on-click-node="false"
       :filter-node-method="filterNode"
       :default-expand-all="false"
+      class="innerbox"
       highlight-current
       accordion
       @node-click="onClickNode"/>
@@ -87,7 +88,7 @@
       // 输入框显示值
       labelModel: '',
       // 实际请求传值
-      valueModel: '0'
+      valueModel: ''
     }
   },
   computed: {
@@ -241,4 +242,26 @@
   .select-tree .el-input.el-input--suffix.rotate .el-input__suffix {
     transform: rotate(180deg);
   }
+
+  .innerbox::-webkit-scrollbar {/*滚动条整体样式*/
+    width: 4px;     /*高宽分别对应横竖滚动条的尺寸*/
+    height: 4px;
+  }
+  .innerbox::-webkit-scrollbar-thumb {/*滚动条里面小方块*/
+    border-radius: 5px;
+    -webkit-box-shadow: inset 0 0 5px rgba(0,0,0,0.2);
+    background: rgba(0,0,0,0.2);
+  }
+  .innerbox::-webkit-scrollbar-track { /*滚动条里面轨道*/
+    -webkit-box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.2);
+    border-radius: 0;
+    background: rgba(0, 0, 0, 0.1);
+  }
+</style>
+<style lang="scss">
+  .el-popover{
+    max-height: 400px;
+    overflow: auto;
+  }
+
 </style>