diff --git a/components/segment/index.js b/components/segment/index.js
index b976c27..186d5a9 100644
--- a/components/segment/index.js
+++ b/components/segment/index.js
@@ -5,14 +5,24 @@ Component({
    */
   properties: {
     headerTitles: Array,
-    selectedTitle: Number
+    defaultSelectIndex: {
+      type: Number,
+      value: 0,
+      observer (newVal, oldVal) {
+        if (newVal != oldVal) {
+          this.setData({
+            selectedTitle: newVal
+          })
+        }
+      }
+    },
   },
 
   /**
    * 组件的初始数据
    */
   data: {
-
+    selectedTitle: 0
   },
 
   /**
@@ -21,6 +31,9 @@ Component({
   methods: {
     bindtap: function (e) {
       const { item } = e.currentTarget.dataset
+      this.setData({
+        selectedTitle: item
+      })
       this.triggerEvent('tapSegment', item)
     },
   }