Abstract: In order to checkout the accuracy of the precipitation estimation product (QPE) of FY-4A meteorological satellite (FY-4A) in Chongqing, choosing two precipitation processes in Chongqing, based on the QPE data of FY-4A and the actual precipitation data of Chongqing automatic weather station, the spatial and temporal deviation characteristics of QPE estimation were analyzed and optimized by using the measured precipitation data of regional automatic weather station. The results show that the QPE data of FY-4A can reflect the spatial distribution and intensity of heavy precipitation in the process of heavy precipitation, and has certain indication to the intensity of heavy precipitation and the change trend of precipitation area. On the whole, the estimated precipitation intensity and range are larger than the actual situatation, There is a certain deviation between the estimated location of heavy precipitation and the actual situation, and the estimated rainfall duration is relatively long. The optimized QPE products are basically consistent with the measured precipitation in intensity and scope, and the accuracy of QPE has been improved in Chongqing, with root mean square error less than 10.