diff --git a/runtime/main/model/index.ts b/runtime/main/model/index.ts
index ac5324e6..cc1ea5f8 100644
--- a/runtime/main/model/index.ts
+++ b/runtime/main/model/index.ts
@@ -145,7 +145,7 @@ export default class Vm {
       `'_innerInit' lifecycle in Vm(${this._type}) and mergedData = ${JSON.stringify(mergedData)}.`
     );
     this.$emit('hook:_innerInit');
-    this._data =  (this.data !== undefined ? this.data : typeof data === 'function' ? data.apply(this) : data) || {};
+    this._data = (typeof data === 'function' ? data.apply(this) : data) || {};
     this._shareData = (typeof shareData === 'function' ? shareData.apply(this) : shareData) || {};
     this._descriptor = options._descriptor;
     if (global.aceapp && global.aceapp.i18n && global.aceapp.i18n.extend) {
@@ -449,9 +449,9 @@ export default class Vm {
       return;
     }
     if (key.indexOf('.') !== -1) {
-      _proxySet(this.data, key, value);
+      _proxySet(this._data, key, value);
     }
-    set(this.data, key, value);
+    set(this._data, key, value);
   }
 
   /**
@@ -463,7 +463,7 @@ export default class Vm {
       Log.warn(`Invalid parameter type: The type of 'key' should be string, not ${typeof key}.`);
       return;
     }
-    del(this.data, key);
+    del(this._data, key);
   }
 
   /**
@@ -659,11 +659,11 @@ export default class Vm {
    * Data of this Vm.
    * @type {*}
    */
-  public get data() {
+  public get __data() {
     return this._data;
   }
 
-  public set data(newData: any) {
+  public set __data(newData: any) {
     this._data = newData;
   }
 
diff --git a/runtime/main/model/pageLife.ts b/runtime/main/model/pageLife.ts
index f5db2b34..4deada95 100644
--- a/runtime/main/model/pageLife.ts
+++ b/runtime/main/model/pageLife.ts
@@ -223,7 +223,7 @@ export function bindPageLifeCycle(vm: Vm, element: Element): void {
       return vm.$emitDirect(`hook:${type}`, saveData);
     }
     function handleNewRequest(data: any) {
-      Object.assign(vm.data, data);
+      Object.assign(vm.__data, data);
       return vm.$emitDirect(`hook:${type}`);
     }
   });
@@ -269,8 +269,8 @@ export function watch(vm: Vm, data: string, callback: ((...args: any) => any) |
  */
 export function initPropsToData(vm: Vm): void {
   vm.props.forEach(prop => {
-    if (vm.data) {
-      vm.data[prop] = vm[prop];
+    if (vm.__data) {
+      vm.__data[prop] = vm[prop];
     }
   });
 }
diff --git a/test/ut/model/index.ts b/test/ut/model/index.ts
index d9beb95c..5195282c 100644
--- a/test/ut/model/index.ts
+++ b/test/ut/model/index.ts
@@ -203,9 +203,9 @@ describe('api of communication between vm and data methods', () => {
     doc.destroy();
     const detail = { aaa: 1 };
     vm.$set('test.aaa', detail);
-    expect(typeof vm.data['test.aaa']).eql('object');
+    expect(typeof vm.__data['test.aaa']).eql('object');
     vm.$delete('test.aaa');
-    expect(typeof vm.data['test.aaa']).eql('undefined');
+    expect(typeof vm.__data['test.aaa']).eql('undefined');
   });
 
   it('$watch', () => {