Abstract: Based on the daily precipitation data during 1961-2016 of 32 stations in Hanjiang river basin, the spatial and temporal distribution characteristics of precipitation are analyzed, and the impact of sea surface temperature and atmospheric circulation on the precipitation in Hanjiang river basin are discussed. The results show that: The spatial distribution of rainfall is similar to that of rainy days of each grade, and the rainfall and rainy days of light rain and moderate rain gradually reduce from the southwest to the northeast; The precipitation centers are located in the southwest and the southeast, and there are more rainfall of heavy rain and above in the northeast; But the rainfall intensities of each grade have no obvious regularity; The PCD increases and the PCD postpones gradually from the southeast to the northwest; There are differences between driving factors of seasonal precipitation; In the aspect of the impact of sea surface temperature on seasonal precipitation, spring precipitation has a negative correlation with the Southwest Indian Ocean sea surface temperature from last November to February, summer precipitation has a positive correlation with the tropical North Atlantic Ocean sea surface temperature from February to August, and autumn precipitation has a negative correlation with the tropical Central-eastern Pacific Ocean sea surface temperature from April to September, but winter precipitation is little affected by sea surface temperature; And in the aspect of the impact of large-scale atmospheric circulation on seasonal precipitation, spring precipitation is related to western Pacific teleconnection pattern, summer precipitation is affected by the position of western Pacific subtropical high and the Ural blocking high, autumn precipitation is related to the India-Burma trough and the low trough of Balkhash Lake, and winter precipitation is influenced by the Eurasian teleconnection pattern; Therefore, atmospheric circulation changes the East Asian winter monsoon intensity to impact on the precipitation in spring and winter and meeting location and intensity of cold air and warm and wet air to influence precipitation in summer and autumn.