diff --git a/LeetCode/src/main/java/com/code/leet/entiy/TreeNode.java b/LeetCode/src/main/java/com/code/leet/entiy/TreeNode.java
index 72606f2..edaf30a 100644
--- a/LeetCode/src/main/java/com/code/leet/entiy/TreeNode.java
+++ b/LeetCode/src/main/java/com/code/leet/entiy/TreeNode.java
@@ -1,6 +1,7 @@
 package com.code.leet.entiy;
 
 
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -25,7 +26,45 @@ public class TreeNode {
         this.right = right;
     }
 
-    public TreeNode(List<Integer> list){
-        
+    public TreeNode(List<Integer> list) {
+        if (list.size() == 0) {
+            return;
+        }
+        List<TreeNode> treeNodeList = new ArrayList<>();
+        int index = 0;
+        for (int i = 0; i < list.size(); i++) {
+            if (treeNodeList.size() == 0) {
+                this.val = list.get(i);
+                treeNodeList.add(this);
+                index = 0;
+            } else {
+                TreeNode root = treeNodeList.get(index);
+                treeNodeList.remove(index);
+                TreeNode left;
+                if (list.get(i) != null && root != null) {
+                    left = new TreeNode(list.get(i));
+                    root.left = left;
+                    treeNodeList.add(index, left);
+                } else {
+                    treeNodeList.add(index, null);
+                }
+                i++;
+                index++;
+                TreeNode right;
+                if (i < list.size()) {
+                    if (list.get(i) != null && root != null) {
+                        right = new TreeNode(list.get(i));
+                        root.right = right;
+                        treeNodeList.add(index, right);
+                    }else{
+                        treeNodeList.add(index, null);
+                    }
+                    index++;
+                }
+                if (index == treeNodeList.size()*2) {
+                    index = 0;
+                }
+            }
+        }
     }
 }