diff --git a/packages/cascader/src/main.vue b/packages/cascader/src/main.vue
index 402569712..17b63ec36 100644
--- a/packages/cascader/src/main.vue
+++ b/packages/cascader/src/main.vue
@@ -48,7 +48,7 @@
       <template v-if="showAllLevels">
         <template v-for="(label, index) in currentLabels">
           {{ label }}
-          <span v-if="index < currentLabels.length - 1"> {{ separator }} </span>
+          <span v-if="index < currentLabels.length - 1" :key="index"> {{ separator }} </span>
         </template>
       </template>
       <template v-else>
@@ -178,7 +178,9 @@ export default {
       menuVisible: false,
       inputHover: false,
       inputValue: '',
-      flatOptions: null
+      flatOptions: null,
+      id: generateId(),
+      needFocus: true
     };
   },
 
@@ -215,9 +217,6 @@ export default {
     },
     cascaderDisabled() {
       return this.disabled || (this.elForm || {}).disabled;
-    },
-    id() {
-      return generateId();
     }
   },
 
@@ -280,7 +279,11 @@ export default {
     hideMenu() {
       this.inputValue = '';
       this.menu.visible = false;
-      this.$refs.input.focus();
+      if (this.needFocus) {
+        this.$refs.input.focus();
+      } else {
+        this.needFocus = true;
+      }
     },
     handleActiveItemChange(value) {
       this.$nextTick(_ => {
@@ -387,6 +390,9 @@ export default {
       this.handlePick([], true);
     },
     handleClickoutside() {
+      if (this.menuVisible) {
+        this.needFocus = false;
+      }
       this.menuVisible = false;
     },
     handleClick() {
diff --git a/packages/cascader/src/menu.vue b/packages/cascader/src/menu.vue
index d814941ff..826c6bd7c 100644
--- a/packages/cascader/src/menu.vue
+++ b/packages/cascader/src/menu.vue
@@ -42,7 +42,8 @@
         changeOnSelect: false,
         popperClass: '',
         hoverTimer: 0,
-        clicking: false
+        clicking: false,
+        id: generateId()
       };
     },
 
@@ -97,9 +98,6 @@
           formatOptions(optionsCopy);
           return loadActiveOptions(optionsCopy);
         }
-      },
-      id() {
-        return generateId();
       }
     },
 
diff --git a/packages/dropdown/src/dropdown.vue b/packages/dropdown/src/dropdown.vue
index 30ab862fa..2daa55030 100644
--- a/packages/dropdown/src/dropdown.vue
+++ b/packages/dropdown/src/dropdown.vue
@@ -66,16 +66,14 @@
         menuItems: null,
         menuItemsArray: null,
         dropdownElm: null,
-        focusing: false
+        focusing: false,
+        listId: `dropdown-menu-${generateId()}`
       };
     },
 
     computed: {
       dropdownSize() {
         return this.size || (this.$ELEMENT || {}).size;
-      },
-      listId() {
-        return `dropdown-menu-${generateId()}`;
       }
     },