diff --git a/src/bus.c b/src/bus.c
index d896235..4c1ae83 100644
--- a/src/bus.c
+++ b/src/bus.c
@@ -33,16 +33,20 @@ int GetBusPosition()
 
 int JudgeOnStation()
 {
-    if (abs(the_bus->distance) == rails->last_node_distance)//表示逆时针
+    if (the_bus->distance == - the_bus->rail_node_pos->last_node_distance)//表示逆时针
     {
         the_bus->distance = 0;
-        the_bus->rail_node_pos = rails->last_node;//逆时针往上一个
+        the_bus->rail_node_pos = the_bus->rail_node_pos->last_node;//逆时针往上一个
         return BUS_TRUE;
     }
-    else if (abs(the_bus->distance) == rails->next_node_distance)//表示顺时针
+    else if (the_bus->distance == the_bus->rail_node_pos->next_node_distance)//表示顺时针
     {
         the_bus->distance = 0;
-        the_bus->rail_node_pos = rails->next_node;//顺时针往下一个
+        the_bus->rail_node_pos = the_bus->rail_node_pos->next_node;//顺时针往下一个
+        return BUS_TRUE;
+    }
+    else if(the_bus->distance == 0) //在站点上原地不动
+    {
         return BUS_TRUE;
     }
     else