diff --git a/include/map.h b/include/map.h
new file mode 100644
index 0000000..80d0cb0
--- /dev/null
+++ b/include/map.h
@@ -0,0 +1,58 @@
+/**
+ * @file map.h
+ * @author wenjf (Orig5826@163.com)
+ * @brief
+ * @version 0.1
+ * @date 2025-05-19
+ *
+ * @copyright Copyright (c) 2025
+ *
+ */
+#ifndef _MAP_H_
+#define _MAP_H_
+
+#include "unicstl_internal.h"
+#include "tree.h"
+
+struct _map_node
+{
+    char* key;
+    void* value;
+};
+
+struct _map
+{
+    // -------------------- private -------------------- 
+    tree_t tree;
+
+    // -------------------- public -------------------- 
+    // kernel
+    bool (*insert)(struct _tree* self, const char* key, void* value);
+    bool (*erase)(struct _tree* self, const char* key);
+    void* (*find)(struct _tree* self, const char* key);
+
+    bool (*get)(struct _tree* self, const char* key, void* value);
+    bool (*set)(struct _tree* self, const char* key, void* value);
+
+    // base
+    bool (*clear)(struct _tree* self);
+    bool (*empty)(struct _tree* self);
+    uint32_t(*size)(struct _tree* self);
+
+    // iter
+    iterator_t(*iter)(struct _tree* self, enum _tree_order);
+
+    // config 
+    compare_fun_t compare;  // !!! you have to implement this function
+
+    // -------------------- debug -------------------- 
+    void (*print_obj)(void* obj);
+};
+typedef struct _map* map_t;
+
+map_t map_new(uint32_t obj_size);
+map_t unordered_map_new(uint32_t obj_size);
+
+void map_free(map_t self);
+
+#endif