diff --git a/problems/0669.修剪二叉搜索树.md b/problems/0669.修剪二叉搜索树.md
index 06d99b9d..2a88f195 100644
--- a/problems/0669.修剪二叉搜索树.md
+++ b/problems/0669.修剪二叉搜索树.md
@@ -286,7 +286,33 @@ class Solution:
         return root
 ```
 Go：
+```go
 
+/**
+ * Definition for a binary tree node.
+ * type TreeNode struct {
+ *     Val int
+ *     Left *TreeNode
+ *     Right *TreeNode
+ * }
+ */
+func trimBST(root *TreeNode, low int, high int) *TreeNode {
+    if root==nil{
+        return nil
+    }
+    if root.Val<low{//如果该节点值小于最小值，则该节点更换为该节点的右节点值，继续遍历
+        right:=trimBST(root.Right,low,high)
+        return right
+    }
+    if root.Val>high{//如果该节点的值大于最大值，则该节点更换为该节点的左节点值，继续遍历
+        left:=trimBST(root.Left,low,high)
+        return left
+    }
+    root.Left=trimBST(root.Left,low,high)
+    root.Right=trimBST(root.Right,low,high)
+    return root
+}
+```