diff --git a/codes/cpp/chapter_hashing/hash_map.cpp b/codes/cpp/chapter_hashing/hash_map.cpp
index 090c2eb10..22d64e991 100644
--- a/codes/cpp/chapter_hashing/hash_map.cpp
+++ b/codes/cpp/chapter_hashing/hash_map.cpp
@@ -37,15 +37,9 @@ int main() {
     for (auto kv : map) {
         cout << kv.first << " -> " << kv.second << endl;
     }
-
-    cout << "\n单独遍历键 Key" << endl;
-    for (auto kv : map) {
-        cout << kv.first << endl;
-    }
-
-    cout << "\n单独遍历值 Value" << endl;
-    for (auto kv : map) {
-        cout << kv.second << endl;
+    cout << "\n使用迭代器遍历 Key->Value" << endl;
+    for (auto iter = map.begin(); iter != map.end(); iter++) {
+        cout << iter->first << "->" << iter->second << endl;
     }
 
     return 0;
diff --git a/docs/chapter_hashing/hash_map.md b/docs/chapter_hashing/hash_map.md
index 666ae508e..061f8a29a 100755
--- a/docs/chapter_hashing/hash_map.md
+++ b/docs/chapter_hashing/hash_map.md
@@ -298,13 +298,9 @@
     for (auto kv: map) {
         cout << kv.first << " -> " << kv.second << endl;
     }
-    // 单独遍历键 key
-    for (auto kv: map) {
-        cout << kv.first << endl;
-    }
-    // 单独遍历值 value
-    for (auto kv: map) {
-        cout << kv.second << endl;
+    // 使用迭代器遍历 key->value
+    for (auto iter = map.begin(); iter != map.end(); iter++) {
+        cout << iter->first << "->" << iter->second << endl;
     }
     ```