diff --git a/src/rail.c b/src/rail.c
index 356d398..a620f24 100644
--- a/src/rail.c
+++ b/src/rail.c
@@ -63,6 +63,9 @@ void FreeRails(rail_node_t *head)
 {
     rail_node_t *p = head;
 
+    // 断开头尾节点
+    head->last_node->next_node = NULL;
+
     while (p != NULL)
     {
         rail_node_t *temp = p;