diff --git a/problems/二叉树的递归遍历.md b/problems/二叉树的递归遍历.md
index 2b5a44dd..220ccf65 100644
--- a/problems/二叉树的递归遍历.md
+++ b/problems/二叉树的递归遍历.md
@@ -222,7 +222,7 @@ Go：
 
 前序遍历:
 ```go
-func PreorderTraversal(root *TreeNode) (res []int) {
+func preorderTraversal(root *TreeNode) (res []int) {
     var traversal func(node *TreeNode)
     traversal = func(node *TreeNode) {
 	if node == nil {
@@ -240,7 +240,7 @@ func PreorderTraversal(root *TreeNode) (res []int) {
 中序遍历:
 
 ```go
-func InorderTraversal(root *TreeNode) (res []int) {
+func inorderTraversal(root *TreeNode) (res []int) {
     var traversal func(node *TreeNode)
     traversal = func(node *TreeNode) {
 	if node == nil {
@@ -257,7 +257,7 @@ func InorderTraversal(root *TreeNode) (res []int) {
 后序遍历:
 
 ```go
-func PostorderTraversal(root *TreeNode) (res []int) {
+func postorderTraversal(root *TreeNode) (res []int) {
     var traversal func(node *TreeNode)
     traversal = func(node *TreeNode) {
 	if node == nil {