diff --git a/src/W800 SDK v1.00.08/app/app_drivers/i2c/BMP280.c b/src/W800 SDK v1.00.08/app/app_drivers/i2c/BMP280.c
index 4868547..2646a20 100644
--- a/src/W800 SDK v1.00.08/app/app_drivers/i2c/BMP280.c	
+++ b/src/W800 SDK v1.00.08/app/app_drivers/i2c/BMP280.c	
@@ -150,6 +150,7 @@ float BMP280_get_pressure(float * const temperature)
     if(!i2c_read(BMP280_I2C_ADDR, BMP280_PRESS_MSB, data, sizeof data)) return 0.0f;
 
     int32_t adc_P = data[0] << 16 | data[1] << 8 | data[2];
+    adc_P >>= 4;
 
     var1 = ((int64_t)t_fine) - 128000;
     var2 = var1 * var1 * (int64_t)_calibration_data.dig_P6;