Abstract: In order to understand the applicability of total precipitation water vapor (LPW) retrieved from the new generation stationary meteorological FY-4A Advanced Geostationary Radiation Imager(AGRI) in the areas with large altitude differences, the total precipitation water vapor (TPW) of FY-4A LPW was caculated by using the observation data of 11 radiosonde sounding stations data in Sichuan province from June 20 to July 31 in 2019 and 2020. The results show that the overall average deviation of FY-4A LPW was negetive, and the total precipitation water vapor was underestimated, especially in the low range of 0~4.5 cm. The FY-4A LPW was highly correlated with radiosonde TPW, the maximum correlation coefficient was 0.95, which was reliable in Sichuan area. And the reliability of FY-4A LPW was affected by altitude. The correlation coefficient between FY-4A LPW and sounding TPW was negatively correlated with altitude.