diff --git a/libraries/mapmodule/src/main/java/com/zhidaoauto/map/sdk/inner/utils/MathUtils.kt b/libraries/mapmodule/src/main/java/com/zhidaoauto/map/sdk/inner/utils/MathUtils.kt
index a1da784867..b1f155652f 100644
--- a/libraries/mapmodule/src/main/java/com/zhidaoauto/map/sdk/inner/utils/MathUtils.kt
+++ b/libraries/mapmodule/src/main/java/com/zhidaoauto/map/sdk/inner/utils/MathUtils.kt
@@ -510,7 +510,7 @@ object MathUtils {
         }
         var sumDis = 0.0
         if(sIndex < list.size-1){
-            for(i in sIndex until list.size){
+            for(i in sIndex until list.size-1){
                 sumDis += distance(list[i], list[i + 1])
                 if(sumDis > maxDis){
                     eIndex = i-1