diff --git a/src/react/ReactChildren.js b/src/react/ReactChildren.js
index bbc07d81edaad3705a3dca0942e1cbc01bff2624..068ebb07fbffa42d4fe2ae8f2045432f676630c5 100644
--- a/src/react/ReactChildren.js
+++ b/src/react/ReactChildren.js
@@ -1,8 +1,49 @@
 function mapChildren(children, func, context) {
     //TODO实现此mapChildren方法
-    return children;
+    if (children == null) {
+        return children;
+    }
+    const result = [];
+    mapIntoWithKey(children, result, func, context);
+    return result;
+}
+function mapIntoWithKey (children, result, func, context) {
+    let arr =[];
+    for (let i = 0; i < children.length; i++) {
+        if (Array.isArray(children[i])) {
+            children[i].map(item => {
+                item.fromArrayIndex = i;
+                arr.push(item)
+            });
+        } else {
+            arr.push(children[i]);
+        }
+    }
+    arr.map((item, index) => {
+        const itemKey = item.key;
+        const fromArrayIndex = item.fromArrayIndex;
+        let newArr = func(item, index);
+        for (let i = 0; i < newArr.length; i++) {
+            newArr[i].key = concatKey(itemKey, newArr[i].key, index, fromArrayIndex);
+        }
+        result.push(...newArr);
+    });
+}
+function isHave(x, index, fromArrayIndex) {
+    if (!fromArrayIndex) {
+        fromArrayIndex = '';
+    } else {
+        fromArrayIndex = fromArrayIndex + ':';
+    }
+    if (x) {
+        return '.' + fromArrayIndex + '$' + x;
+    } else {
+        return '.' + index;
+    }
+}
+function concatKey(a, b, index, fromArrayIndex) {
+    return isHave(a, index, fromArrayIndex) + '/' + isHave(b, index);
 }
-
 export {
     mapChildren as map,
 };
\ No newline at end of file