diff --git a/include/bus.h b/include/bus.h
index 91c69d8..acc3b17 100644
--- a/include/bus.h
+++ b/include/bus.h
@@ -28,14 +28,13 @@ extern bus_t *the_bus;
 
 /**
  * 每个时刻使公交车前进
- * @param rails 轨道链表
  * @param direction 公交车前进的方向
  */
 void RunBus(int direction);
 
 /**
  * 判断公交车是否到站
- * @return
+ * @return BUS_TRUE为到站，BUS_FALSE为未到站
  */
 int JudgeOnStation();
 
@@ -44,4 +43,12 @@ int JudgeOnStation();
  * @return 公交车当前所在的位置
  */
 int GetBusPosition();
+
+/**
+ * 给出在指定的方向下，指定的请求于公交车当前位置的距离
+ * @param query 指定的请求
+ * @param orientation 指定的方向 BUS_CLOCK_WISE BUS_COUNTER_CLOCK_WISE
+ * @return 距离
+ */
+int GetQueryDistance(bus_query_t *query, int orientation);
 #endif //AUTO_PILOT_BUS_BUS_H
diff --git a/include/bus_io.h b/include/bus_io.h
index f9d6c23..c7c3735 100644
--- a/include/bus_io.h
+++ b/include/bus_io.h
@@ -26,8 +26,6 @@ int ReadInput(char* inputString);
 
 /**
  * 打印当前的状态
- * @param rails 轨道链表
- * @return 返回需输出的字符串
  */
 void PrintState();
 
diff --git a/include/rail.h b/include/rail.h
index 0ab4964..7ff4f07 100644
--- a/include/rail.h
+++ b/include/rail.h
@@ -35,6 +35,11 @@ typedef struct rail_node rail_node_t;
  */
 extern rail_node_t *rails;
 
+/**
+ * 轨道的总长度
+ */
+extern int all_distance;
+
 /**
  * 全局的计时器
  */
diff --git a/src/bus.c b/src/bus.c
index 6f5d566..6c49450 100644
--- a/src/bus.c
+++ b/src/bus.c
@@ -82,4 +82,30 @@ int JudgeOnStation()
     {
         return BUS_FAlSE;
     }
+}
+
+int GetQueryDistance(bus_query_t *query, int orientation)
+{
+    rail_node_t *target_node = query->node;
+    rail_node_t *now_node = the_bus->rail_node_pos;
+    int distance = 0;
+
+    if(orientation == BUS_CLOCK_WISE)
+    {
+        while (now_node != target_node)
+        {
+            distance += now_node->next_node_distance;
+            now_node = now_node->next_node;
+        }
+    }
+    else if(orientation == BUS_COUNTER_CLOCK_WISE)
+    {
+        while (now_node != target_node)
+        {
+            distance += now_node->last_node_distance;
+            now_node = now_node->last_node;
+        }
+    }
+
+    return distance;
 }
\ No newline at end of file
diff --git a/src/bus_io.c b/src/bus_io.c
index 0375dc8..4ba1135 100644
--- a/src/bus_io.c
+++ b/src/bus_io.c
@@ -151,6 +151,7 @@ rail_node_t *ReadConfigFile()
         chosen_strategy = BUS_FCFS;
     }
 
+    all_distance = distance * total_station;
     rail_node_t *head = CreateRails(distance, total_station);
     return head;
 }
diff --git a/src/rail.c b/src/rail.c
index a620f24..d6cf67d 100644
--- a/src/rail.c
+++ b/src/rail.c
@@ -2,6 +2,7 @@
 
 rail_node_t *rails = NULL;
 int bus_time = 0;
+int all_distance = 0;
 
 rail_node_t *CreateRails(int length, int node_num)
 {