diff --git a/dynamics/udp.go b/dynamics/udp.go
index 5e5839f..f76c51c 100644
--- a/dynamics/udp.go
+++ b/dynamics/udp.go
@@ -230,10 +230,10 @@ func decoderDynamicsTrainInfo(buf []byte) *TrainInfo {
 	b := buf[12]
 	trainInfo.UpSlope = (b & (1 << 7)) != 0
 	trainInfo.Up = (b & (1 << 6)) != 0
-	trainInfo.TotalResistance = binary.BigEndian.Uint32(buf[14:18])
-	trainInfo.AirResistance = binary.BigEndian.Uint32(buf[18:22])
-	trainInfo.SlopeResistance = binary.BigEndian.Uint32(buf[22:26])
-	trainInfo.CurveResistance = binary.BigEndian.Uint32(buf[26:30])
+	trainInfo.TotalResistance = int32(binary.BigEndian.Uint32(buf[14:18]))
+	trainInfo.AirResistance = int32(binary.BigEndian.Uint32(buf[18:22]))
+	trainInfo.SlopeResistance = int32(binary.BigEndian.Uint32(buf[22:26]))
+	trainInfo.CurveResistance = int32(binary.BigEndian.Uint32(buf[26:30]))
 	trainInfo.Speed = math.Float32frombits(binary.BigEndian.Uint32(buf[30:34]))
 	trainInfo.HeadSpeed1 = math.Float32frombits(binary.BigEndian.Uint32(buf[34:38]))
 	trainInfo.HeadSpeed2 = math.Float32frombits(binary.BigEndian.Uint32(buf[38:42]))
diff --git a/dynamics/udpData.go b/dynamics/udpData.go
index 8e9818f..b163497 100644
--- a/dynamics/udpData.go
+++ b/dynamics/udpData.go
@@ -25,13 +25,13 @@ type TrainInfo struct {
 	//列车当前运行方向（偏移量增大/减小方向）
 	Up bool
 	//实际运行阻力（总）（N）
-	TotalResistance uint32
+	TotalResistance int32
 	//阻力1（空气阻力）（N）
-	AirResistance uint32
+	AirResistance int32
 	//阻力2（坡道阻力）（N）
-	SlopeResistance uint32
+	SlopeResistance int32
 	//阻力3（曲线阻力）（N）
-	CurveResistance uint32
+	CurveResistance int32
 	//列车运行速度（m/s）
 	Speed float32
 	//头车速传1速度值（m/s）