diff --git a/src/bus.c b/src/bus.c
index 6c2a29d..efc3bf3 100644
--- a/src/bus.c
+++ b/src/bus.c
@@ -1,3 +1,41 @@
 #include "bus.h"
+#include "math.h"
+bus_t *the_bus = NULL;
+void RunBus(int direction)
+{
+    if(direction == 0)//顺时针
+    {
+        the_bus->distance++;
+        if(the_bus->distance == rails->next_node_distance)
+        {
+            the_bus->distance=0;//到达一个站点用重新置为0
+        }
+    }
+    else if(direction == 1)
+    {
+        the_bus->distance--;
+        if(abs(the_bus->distance) ==rails->last_node_distance)
+        {
+            the_bus->distance=0;//到达一个站点又重新置为0
+        }
+    }
 
-bus_t *the_bus = NULL;
\ No newline at end of file
+}
+int GetBusPosition()
+{
+    int a,b;
+    a=the_bus->rail_node_pos->id;//指向站点的指针以及这个指针对应的站台id；
+    b=a*(rails->last_node_distance)+abs(the_bus->distance);
+    return b;
+}
+int JudgeOnStation()
+{
+    if(abs(the_bus->distance) == rails->last_node_distance)
+    {
+        return 1;
+    }
+    else 
+    {
+        return 0;
+    }
+}
\ No newline at end of file