diff --git a/App/Inc/anemometer_dev.h b/App/Inc/anemometer_dev.h
index c22e84d..c09a808 100644
--- a/App/Inc/anemometer_dev.h
+++ b/App/Inc/anemometer_dev.h
@@ -53,6 +53,9 @@
 // 富奥通结构 L = 118946
 // #define DISTANCE 118946
 
+// 公式中的二倍cos45
+#define TWO_COS45 1.41421356237309f
+
 // x方向
 #define WIND_DIRECTION_X 0x00
 // y方向
diff --git a/App/Src/anemometer_dev.c b/App/Src/anemometer_dev.c
index 08a8aa9..208fcab 100644
--- a/App/Src/anemometer_dev.c
+++ b/App/Src/anemometer_dev.c
@@ -442,7 +442,7 @@ void wind_task(void const * argument)
       weather_info.wind_c = (g_stConfigInfo.transducer_distace * 2.0f)/2.0f*(1.0f/tofx+1.0f/tofy); 
 //      weather_info.wind_velocity_x = 0-DISTANCE*dtof/1.41422f/tofx/tofx;
 //      修正公式
-      weather_info.wind_velocity_x = 0-(g_stConfigInfo.transducer_distace * 2.0f)*dtof/1.41422f/tofx/tofy;
+      weather_info.wind_velocity_x = 0-(g_stConfigInfo.transducer_distace * 2.0f)*dtof/TWO_COS45/tofx/tofy;
     }
     
      // 通道3 通道4 测试东西风速
@@ -502,7 +502,7 @@ void wind_task(void const * argument)
       weather_info.wind_c = (g_stConfigInfo.transducer_distace * 2.0f)/2.0f*(1.0f/tofx+1.0f/tofy); 
 //      weather_info.wind_velocity_y = DISTANCE*dtof/1.41422f/tofx/tofx;
 //      修正公式
-      weather_info.wind_velocity_y = (g_stConfigInfo.transducer_distace * 2.0f)*dtof/1.41422f/tofx/tofy;
+      weather_info.wind_velocity_y = (g_stConfigInfo.transducer_distace * 2.0f)*dtof/TWO_COS45/tofx/tofy;
     }
     
     weather_info.wind_velocity = sqrtf(weather_info.wind_velocity_x*weather_info.wind_velocity_x + weather_info.wind_velocity_y*weather_info.wind_velocity_y);