diff --git a/examples/routers/cascader.vue b/examples/routers/cascader.vue
index a889181..02b5b5f 100644
--- a/examples/routers/cascader.vue
+++ b/examples/routers/cascader.vue
@@ -1,5 +1,11 @@
 <template>
-    <Cascader v-model="value3" :data="data" filterable style="width: 400px"></Cascader>
+    <div>
+        <Cascader v-model="value3" :data="data" filterable style="width: 400px"></Cascader>
+        <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
+        <Cascader v-model="value3" :data="data" filterable style="width: 400px"></Cascader>
+        <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>
+        <Cascader v-model="value3" :data="data" filterable style="width: 400px"></Cascader>
+    </div>
 </template>
 <script>
     export default {
diff --git a/package-lock.json b/package-lock.json
index 4aa720a..c2b31e9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14027,7 +14027,8 @@
     "vue": {
       "version": "2.5.16",
       "resolved": "https://registry.npmjs.org/vue/-/vue-2.5.16.tgz",
-      "integrity": "sha512-/ffmsiVuPC8PsWcFkZngdpas19ABm5mh2wA7iDqcltyCTwlgZjHGeJYOXkBMo422iPwIcviOtrTCUpSfXmToLQ=="
+      "integrity": "sha512-/ffmsiVuPC8PsWcFkZngdpas19ABm5mh2wA7iDqcltyCTwlgZjHGeJYOXkBMo422iPwIcviOtrTCUpSfXmToLQ==",
+      "dev": true
     },
     "vue-hot-reload-api": {
       "version": "2.3.0",
@@ -14227,15 +14228,6 @@
         }
       }
     },
-    "vue-popperjs": {
-      "version": "1.2.6",
-      "resolved": "https://registry.npmjs.org/vue-popperjs/-/vue-popperjs-1.2.6.tgz",
-      "integrity": "sha512-0SEPDdQY8NxRcDiWXTgW6nMpRcc+rSpcELsLszuPzehBqQ5/9AGAr2OGKh1smwcaRe8Rb1CtE399vNz9+jYorw==",
-      "requires": {
-        "popper.js": "1.14.1",
-        "vue": "2.5.16"
-      }
-    },
     "vue-router": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/vue-router/-/vue-router-3.0.1.tgz",
diff --git a/src/components/cascader/cascader.vue b/src/components/cascader/cascader.vue
index ae2810a..6d8c945 100644
--- a/src/components/cascader/cascader.vue
+++ b/src/components/cascader/cascader.vue
@@ -357,6 +357,7 @@
                     if (this.transfer) {
                         this.$refs.drop.update();
                     }
+                    this.broadcast('Drop', 'on-update-popper');
                 } else {
                     if (this.filterable) {
                         this.query = '';
@@ -365,6 +366,7 @@
                     if (this.transfer) {
                         this.$refs.drop.destroy();
                     }
+                    this.broadcast('Drop', 'on-destroy-popper');
                 }
                 this.$emit('on-visible-change', val);
             },
--
libgit2 0.21.4