Abstract: Based on the four-factor theory of natural disaster risk, the daily precipitation data of 16 meteorological observation stations in the Qujiang River Basin from 1970 to 2021 were selected. combined with the local basicgeographic information and social economy, a risk assessment system of rainstorm and flood disaster in the Qujiang River Basin composed of 12 indicators was constructed, and GIS technology was used to quantitatively evaluate and divide it. The results show that: (1) The intensity and frequency of rainstorm in the north of Qujiang River Basin are high, and the risk is generally high in the north and low in the south. (2) The southern region is characterized by low-lying terrain, dense river network, dense population and developed economy, and the overall characteristics of exposure and vulnerability are high in the south and low in the north. (3) The comprehensive risk of rainstorm and flood disasters in Nanjiang, northern Bazhong, northwest Pingchang, Quxian, Guang'an, Dazhu and the west of Linshui is the highest, and the leading factors of high risk are different in different regions.