diff --git a/src/index.js b/src/index.js
index 82433470761e01cd6adcfe1e06535ee1819bc83b..4e84a73388aeb772709aa8c547eee5744080ad74 100644
--- a/src/index.js
+++ b/src/index.js
@@ -7,7 +7,7 @@ class Child extends Component {
     const mappedChildren = React.Children.map(
       this.props.children,
       (item, index) => (
-        [<div key={`div${index}A`}>{item}</div>, <div key={`div${index}B`}>{item}</div>]
+        [<div key={`div${index}A`}>{item}</div>, [<span>2222</span>], <div key={`div${index}B`}>{item}</div>]
       )
     );
     console.log(mappedChildren);
diff --git a/src/react/ReactChildren.js b/src/react/ReactChildren.js
index bbc07d81edaad3705a3dca0942e1cbc01bff2624..2c3e1fc2deebf8570cb68f0a8777b8e3f69031fc 100644
--- a/src/react/ReactChildren.js
+++ b/src/react/ReactChildren.js
@@ -1,6 +1,52 @@
+import {ReactElement} from './ReactElement'
+
 function mapChildren(children, func, context) {
     //TODO实现此mapChildren方法
-    return children;
+    let result = []
+    for(let i = 0,len =children.length;i < len; i++) {
+        let child = children[i]
+        let newEl = null
+        if(Array.isArray(child)) {
+            child.forEach((item, index)=>{
+                let oldkey = item.key ? item.key : i
+                newEl = func(child, i)
+                newEleChange(result, newEl, oldkey)
+                console.log(oldkey)
+            })
+        }else{
+            let oldkey = child.key ? child.key : i
+            newEl = func(child, i)
+            newEleChange(result, newEl, oldkey)
+            console.log(oldkey)
+        }
+        
+    }
+    console.log(result, 'jieguo')
+    return result; 
+}
+
+// key的算法不懂怎么弄
+function newEleChange(result, newEl, oldkey){
+    if(Array.isArray(newEl)) {
+        for(let j = 0, len = newEl.length; j < len; j++) {
+            let subChild = newEl[j]
+            newEleChange(result, subChild, oldkey)
+        }
+    }else{
+        replaceKeyAndClone(result, newEl, oldkey)
+    }
+}
+
+function replaceKeyAndClone(result, oldEl, oldkey) {
+    result.push(ReactElement(
+        oldEl.type,
+        oldkey+'/'+(oldEl.key?oldEl.key:''),
+        oldEl.ref,
+        oldEl._self,
+        oldEl._source,
+        oldEl._owner,
+        oldEl.props,
+    ))
 }
 
 export {
diff --git a/src/react/ReactElement.js b/src/react/ReactElement.js
index 25fdf5ea1b24116f963f57890892d03e3d2e3a78..823e9f56ef97987c5e9dc1e16f79a79a132be1fe 100644
--- a/src/react/ReactElement.js
+++ b/src/react/ReactElement.js
@@ -59,7 +59,7 @@ export function createElement(type, config, children) {
         type, key, ref, self, source, ReactCurrentOwner.current, props
     )
 }
-function ReactElement(type, key, ref, _self, _source, _owner, props) {
+export function ReactElement(type, key, ref, _self, _source, _owner, props) {
     const element = {
         $$typeof: REACT_ELEMENT_TYPE,
         type,
@@ -71,4 +71,4 @@ function ReactElement(type, key, ref, _self, _source, _owner, props) {
         _source
     }
     return element;
-}
\ No newline at end of file
+}