Abstract:The Fengyun-2H （FY-2H） satellite was successfully launched on 5 June 2018 and the operation is stable ever since. The scanning radiometer VISSR-2 (stretched visible and infrared spin scan radiometer) on-board can provide high spatio-temporal resolution atmospheric TPW (total precipitable water) products. Based on the split window algorithm, FY-2H VISSR TPW performs inversion by adding a 6.9 μm channel.This article uses the water vapor products generated by the radiosonde in 2019 to evaluate the quality of the FY-2H TPW product from the two aspects of product accuracy and stability. Compared with the global sounding data of the first seven days of each month in January, April, July, and October 2019, the root mean square error (RMSE) of FY-2H TPW is 4.92 mm, and the correlation coefficient reaches 0.96.The relative error is within 20%, and the data accuracy is high not only during the daytime, but also at night. The standard deviation of the monthly RMSE of FY-2H TPW products relative to sounding data from January to December 2019 is 0.68 mm, indicating that FY-2H TPW products are relatively stable during the inspection period. Based on the analysis and synthesis of the monthly average TPW products, FY-2H TPW can correctly reflect the distribution of atmospheric precipitation in the Belt and Road Region. According to the above results, the FY-2H VISSR TPW product has high precision and stable quality, and has the application ability to be invested in the Belt and Road area.