diff --git a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/sal/Device.java b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/sal/Device.java
index 07833ac6..cbf8c365 100644
--- a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/sal/Device.java
+++ b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/sal/Device.java
@@ -123,7 +123,7 @@ public class Device {
     }
 
     public void clearStat(){
-        if(fixedNum+floatNum == 0 && d3xxCount==0) noFixedAndFloatResult++;
+        if(fixedNum+floatNum == 0 && deviceType == DEVICE_ROVER) noFixedAndFloatResult++;
         else noFixedAndFloatResult = 0;
 
         d3xxCount = 0;