diff --git a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/message/D3F0SelfCheckMessage.java b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/message/D3F0SelfCheckMessage.java
index 2d552203..3167a4f2 100644
--- a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/message/D3F0SelfCheckMessage.java
+++ b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/message/D3F0SelfCheckMessage.java
@@ -45,8 +45,8 @@ public class D3F0SelfCheckMessage extends BaseMessage {
         if (verType > 0) auxInfo = " type:" + verType;
 
         if(src.readableBytes()>=4) {
-            statusMsg.setTemperature((float) (src.readUnsignedShort() / 10));
-            statusMsg.setHumidity((float) (src.readUnsignedShort() / 10));
+            statusMsg.setTemperature((float) (src.readShort() / 10));
+            statusMsg.setHumidity((float) (src.readShort() / 10));
         }
         // imei
         if(src.readableBytes()>=15){