diff --git a/.vscode/settings.json b/.vscode/settings.json
index d93da67..d113c91 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -22,6 +22,7 @@
         "unity.h": "c",
         "unity_config.h": "c",
         "unity_internals.h": "c",
-        "stdarg.h": "c"
+        "stdarg.h": "c",
+        "graph.h": "c"
     }
 }
\ No newline at end of file
diff --git a/include/graph.h b/include/graph.h
index 5d4ed8e..c1033ff 100644
--- a/include/graph.h
+++ b/include/graph.h
@@ -15,7 +15,7 @@
 
 struct _graph_node {
     void *obj;
-    struct _graph_node *next;
+    uint32_t **edge;
 };
 
 struct _graph {
diff --git a/include/unicstl.h b/include/unicstl.h
index e8b281c..7ec3da5 100644
--- a/include/unicstl.h
+++ b/include/unicstl.h
@@ -17,5 +17,6 @@
 #include "deque.h"
 #include "tree.h"
 #include "heap.h"
+#include "graph.h"
 
 #endif // _UNICSTL_H_
diff --git a/src/graph.c b/src/graph.c
index db7dbc7..b842078 100644
--- a/src/graph.c
+++ b/src/graph.c
@@ -34,7 +34,14 @@ static bool graph_clear(struct _graph *self)
     {
         return 0;
     }
-    self->_head->obj = NULL;
+    for(uint32_t i = 0; i < self->_capacity; i++)
+    {
+        for(uint32_t j = 0; j < self->_capacity; j++)
+        {
+            self->_head->edge[i][j] = 0;
+        }
+    }
+    self->_size = 0;
     return self->_size = 0;
 }
 
@@ -47,11 +54,43 @@ static void graph_destory(struct _graph *self)
     self->clear(self);
     if(self->_head != NULL)
     {
+        if(self->_head->obj != NULL)
+        {
+            free(self->_head->obj);
+        }
+
+        if(self->_head->edge != NULL)
+        {
+            for(uint32_t i = 0; i < self->_capacity; i++)
+            {
+                if(self->_head->edge[i] != NULL)
+                {
+                    free(self->_head->edge[i]);
+                }
+            }
+            free(self->_head->edge);
+        }
         free(self->_head);
         self->_head = NULL;
     }
 }
 
+static void graph_init2(struct _graph *self)
+{
+    if(self == NULL || self->_head == NULL)
+    {
+        return;
+    }
+
+    for(uint32_t i = 0; i < self->_capacity; i++)
+    {
+        for(uint32_t j = 0; j < self->_capacity; j++)
+        {
+            self->_head->edge[i][j] = 0;
+        }
+    }
+}
+
 graph_t graph_new2(uint32_t obj_size, uint32_t capacity)
 {
     if(obj_size == 0 || capacity == 0)
@@ -70,28 +109,53 @@ graph_t graph_new2(uint32_t obj_size, uint32_t capacity)
     graph->_capacity = capacity;
     graph->_ratio = 1;
 
+    graph->init = graph_init2;
+    graph->destory = graph_destory;
+
     graph->size = graph_size;
     graph->capacity = graph_capacity;
+    graph->clear = graph_clear;
 
     graph->_head = (struct _graph_node *)malloc(sizeof(struct _graph_node));
     if(graph->_head == NULL)
     {
         goto done1;
     }
-    graph->_head->next = NULL;
 
-    graph->_head->obj = (void *)malloc(graph->_obj_size * graph->_capacity * graph->_capacity);
+    graph->_head->obj = (void *)malloc(graph->_obj_size);
     if(graph->_head->obj == NULL)
     {
         goto done2;
     }
 
+    graph->_head->edge = (uint32_t **)malloc(graph->_capacity * sizeof(uint32_t *));
+    if(graph->_head->edge == NULL)
+    {
+        goto done3;
+    }
+
+    uint32_t i = 0;
+    for(i = 0; i < graph->_capacity; i++)
+    {
+        graph->_head->edge[i] = (uint32_t *)malloc(graph->_capacity * sizeof(uint32_t));
+        if(graph->_head->edge[i] == NULL)
+        {
+            goto done4;
+        }
+    }
+
     // init graph
     graph->init(graph);
 
     return graph;
-
-    // free(graph->_head->obj)
+done4:
+    for(uint32_t j = 0; j < i; j++)
+    {
+        free(graph->_head->edge[j]);
+    }
+    free(graph->_head->edge);
+done3:
+    free(graph->_head->obj);
 done2:
     free(graph->_head);
 done1:
diff --git a/test/test.c b/test/test.c
index e046aaf..846e1e2 100644
--- a/test/test.c
+++ b/test/test.c
@@ -84,6 +84,7 @@ int main(int argc, char const *argv[])
     TEST_ADD(test_deque);
     TEST_ADD(test_heap);
     TEST_ADD(test_tree);
+    TEST_ADD(test_graph);
     
     return UNITY_END();
 }
diff --git a/test/test.h b/test/test.h
index a8ec0db..514c0af 100644
--- a/test/test.h
+++ b/test/test.h
@@ -47,5 +47,6 @@ void test_list(void);
 void test_deque(void);
 void test_tree(void);
 void test_heap(void);
+void test_graph(void);
 
 #endif // _TEST_H_
diff --git a/test/test_graph.c b/test/test_graph.c
new file mode 100644
index 0000000..2047d4e
--- /dev/null
+++ b/test/test_graph.c
@@ -0,0 +1,24 @@
+/**
+ * @file test_graph.c
+ * @author wenjf (Orig5826@163.com)
+ * @brief 
+ * @version 0.1
+ * @date 2024-09-03
+ * 
+ * @copyright Copyright (c) 2024
+ * 
+ */
+#include "test.h"
+
+void test_graph_new(void)
+{
+    graph_t g = graph_new2(sizeof(int), 10);
+    TEST_ASSERT(g != NULL);
+    graph_free(&g);
+    TEST_ASSERT(g == NULL);
+}
+
+void test_graph(void)
+{
+    RUN_TEST(test_graph_new);
+}