diff --git a/README.md b/README.md
index a27daad..fa0c485 100644
--- a/README.md
+++ b/README.md
@@ -72,7 +72,7 @@ export default {
 
 <template>
   <div>
-    <date-picker v-model="time1" :first-day-of-week="1"></date-picker>
+    <date-picker v-model="time1" valueType="format" :first-day-of-week="1"></date-picker>
     <date-picker v-model="time2" type="datetime" :time-picker-options="timePickerOptions"></date-picker>
     <date-picker v-model="time3" range :shortcuts="shortcuts"></date-picker>
     <date-picker v-model="value" :lang="lang"></date-picker>
diff --git a/README.zh-CN.md b/README.zh-CN.md
index 6380015..050b8d5 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -72,7 +72,7 @@ export default {
 
 <template>
   <div>
-    <date-picker v-model="time1" :first-day-of-week="1"></date-picker>
+    <date-picker v-model="time1" valueType="format" :first-day-of-week="1"></date-picker>
     <date-picker v-model="time2" type="datetime" :time-picker-options="timePickerOptions"></date-picker>
     <date-picker v-model="time3" range :shortcuts="shortcuts"></date-picker>
     <date-picker v-model="value" :lang="lang"></date-picker>
diff --git a/demo/index.js b/demo/index.js
index 0661da1..e9ec67c 100644
--- a/demo/index.js
+++ b/demo/index.js
@@ -47,7 +47,7 @@ new Vue({
   },
   render (h) {
     const example1 = {
-      'base': '<date-picker v-model="value1" lang="en" ></date-picker>',
+      'base': '<date-picker v-model="value1" valueType="format" lang="en" ></date-picker>',
       'range': '<date-picker v-model="value2" range appendToBody></date-picker>',
       'month': '<date-picker v-model="value10" lang="en" type="month" format="YYYY-MM"></date-picker>',
       'year': '<date-picker v-model="value11" lang="en" type="year" format="YYYY"></date-picker>',