diff --git a/packages/wxa-core/src/diff/flatten.js b/packages/wxa-core/src/diff/flatten.js
index 0b0c58bf..6610aa16 100644
--- a/packages/wxa-core/src/diff/flatten.js
+++ b/packages/wxa-core/src/diff/flatten.js
@@ -1,6 +1,13 @@
 // fork from https://github.com/hughsk/flat/blob/master/index.js
 // modify for wxa
 
+const getType = (v) => Object.prototype.toString.call(v);
+
+const is = (t, v) => {
+    return getType(v) === `[object ${t}]`;
+};
+
+
 function flatten(oldValue, newValue, diff, opts) {
     // if diff element is an array, then just return the array in wxa. so we allways need safe options in wxa.
     opts = opts || {safe: true};
@@ -10,59 +17,75 @@ function flatten(oldValue, newValue, diff, opts) {
     let output = {};
 
     function step(oldValue, newValue, diff, prev, currentDepth) {
-      currentDepth = currentDepth || 1;
-      Object.keys(diff).forEach(function(key) {
-        let diffChildValue = diff[key];
-        let isDiffChildValueArray = opts.safe && Array.isArray(diffChildValue);
-
-        let typeOfDiff = Object.prototype.toString.call(diffChildValue);
-        let isDiffChildValueObject = (
-            typeOfDiff === '[object Object]' ||
-            typeOfDiff === '[object Array]'
-        );
+        currentDepth = currentDepth || 1;
 
-        let sourceValue;
-        let newKey;
-        let newChildValue = newValue[key];
+        Object.keys(diff).forEach(function(key) {
+            let diffChildValue = diff[key];
+            // new child array added
+            let isDiffChildValueArray =
+                opts.safe && Array.isArray(diffChildValue);
 
-        // Only digits (0-9) can be put inside [] in the path string
-        newKey = prev ? /^\d+$/.test(key) ? prev + '[' + key + ']' : prev + delimiter + key : key;
+            let isDiffChildValueObject = is('Object', diffChildValue) || is('Array', diffChildValue);
 
+            let newKey;
+            let newChildValue = newValue[key];
+            let sourceValue = oldValue ? oldValue[key] : void(0);
 
-        if (oldValue) {
-            // hasValue, meaning that new value still contain old one.
-            sourceValue = oldValue[key];
+            if (Array.isArray(oldValue) && Array.isArray(newValue)) {
+                // array element changed or added.
+                newKey = prev ? prev + `[${key}]` : key;
+            } else {
+                newKey = prev ? prev + delimiter + key : key;
+            }
 
+            // Check Array
             if (
-                (
-                    Array.isArray(sourceValue) ||
-                    (Object.prototype.toString.call(sourceValue) === '[object Object]')
-                ) &&
-                Object.keys(diffChildValue).some((key)=>diffChildValue[key]===void(0))
+                (Array.isArray(sourceValue) || is('Object', sourceValue)) &&
+                Object.keys(diffChildValue).some((key) => diffChildValue[key] === void 0)
             ) {
-                // console.log(currentDepth, ' element deleted ', newKey);
                 // some array or object element have been deleted.
                 // return new array or object.
-                output[newKey] = newChildValue;
-                return;
-            } else if (Array.isArray(oldValue)) {
-                // array element changed or added.
-                newKey = prev ? prev + `[${key}]` : key;
+                return output[newKey] = newChildValue;
+            }
+
+            if (
+                !isDiffChildValueObject ||
+                getType(sourceValue) !== getType(newChildValue)
+            ) {
+                return output[newKey] = diffChildValue;
             }
-        }
 
-        if (!isDiffChildValueArray && isDiffChildValueObject && Object.keys(diffChildValue).length &&
-          (!opts.maxDepth || currentDepth < maxDepth)) {
-          return step(sourceValue, newChildValue, diffChildValue, newKey, currentDepth + 1);
-        }
+            if (
+                !isDiffChildValueArray &&
+                isDiffChildValueObject &&
+                Object.keys(diffChildValue).length &&
+                (!opts.maxDepth || currentDepth < maxDepth)
+            ) {
+                if (
+                    currentDepth < 2 ||
+                    (currentDepth >= 2 && Object.keys(diffChildValue).length <= 4)
+                ) {
+                    // tiny object
+                    // end process go next step
+                    return step(
+                        sourceValue,
+                        newChildValue,
+                        diffChildValue,
+                        newKey,
+                        currentDepth + 1
+                    );
+                } else {
+                    return output[newKey] = newChildValue;
+                }
+            }
 
-        output[newKey] = diffChildValue;
-      });
+            output[newKey] = diffChildValue;
+        });
     }
 
     step(oldValue, newValue, diff);
 
     return output;
-  }
+}
 
 export default flatten;
diff --git a/packages/wxa-core/test/diff/diff.test.js b/packages/wxa-core/test/diff/diff.test.js
index c31fb7ad..d422dee2 100644
--- a/packages/wxa-core/test/diff/diff.test.js
+++ b/packages/wxa-core/test/diff/diff.test.js
@@ -52,4 +52,16 @@ describe('diff array', ()=>{
 
         expect(pageDiff({x: arr2})).toMatchObject({'x[0]': {a: 1, b: 2}});
     });
+
+    test('get diff properties', ()=>{
+        let page = {
+            data: {
+                x: arr1,
+            },
+        };
+
+        let pageDiff = diff.bind(page);
+
+        expect(pageDiff({x: [{a: 1, b: 2, c: {a: 1}}]})).toMatchObject({'x[0].c': {a: 1}});
+    });
 });
diff --git a/packages/wxa-core/test/diff/flatten.test.js b/packages/wxa-core/test/diff/flatten.test.js
index 0829e99e..b03bb3d5 100644
--- a/packages/wxa-core/test/diff/flatten.test.js
+++ b/packages/wxa-core/test/diff/flatten.test.js
@@ -24,7 +24,7 @@ describe('flatten object for wxa', ()=>{
 
         expect(flatten(
             {
-                a: 2,
+                a: {c: {d: 3}},
             },
             {
                 a: {c: {d: 1}},
@@ -76,7 +76,7 @@ describe('flatten object for wxa', ()=>{
                     '1': {b: 1},
                 },
             },
-        })).toMatchObject({'a.c[1].b': 1});
+        })).toMatchObject({'a.c[1]': {'b': 1}});
 
         expect(flatten(
             {
@@ -152,4 +152,68 @@ describe('flatten object for wxa', ()=>{
 
         expect(flatten(oldValue, newValueWithDelete, {school: void(0), fav: {a: void(0), b: 'football'}})).toMatchObject({school: void(0), fav: {b: 'football'}});
     });
+
+    test('Big Different Object', ()=>{
+        expect(flatten(
+            {
+                user$: {
+                    b: 3,
+                    order: {
+                        c: [1, 2],
+                        d: 1,
+                        e: 2,
+                        f: 3,
+                        d1: 1,
+                        e22: 2,
+                        f2: 4,
+                    },
+                },
+            },
+            {
+                user$: {
+                    b: 3,
+                    order: {
+                        c: [1, 2],
+                        d: 1,
+                        e: 2,
+                        f: 3,
+                        d1: 1,
+                        e22: 2,
+                        f2: 4,
+                    },
+                },
+            },
+            {
+                user$: {
+                    b: 4,
+                    order: {
+                        c: [1, 2],
+                        d: 1,
+                        e: 2,
+                        f: 3,
+                        d1: 1,
+                    },
+                },
+            }
+        )).toMatchObject({
+            'user$.b': 4,
+            'user$.order': {c: [1, 2], d: 1, e: 2, f: 3, d1: 1, e22: 2, f2: 4},
+          });
+    });
+
+    test('diff data Array to Object', ()=>{
+        expect(flatten(
+            {
+                user$: {},
+            },
+            {
+                user$: [],
+            },
+            {
+                user$: [],
+            }
+        )).toMatchObject({
+            'user$': [],
+          });
+    });
 });