Abstract: Waterlogging has always been a natural disaster that troubles the development of human society. The crop reduction caused by waterlogging has threatened food security. The research on risk index,risk level and risk evaluation of waterlogging has been one of the hot topics,which has important theoretical and practical significance. In this paper,the Luoshan Drainage Area in Four-lake Watershed is chosen as the study area. The waterlogging disaster index system is established,and the index weights are calculated by using the AHP and CRITIC method. Then the waterlogging risk assessment model is established,and the risk degree under different mitigation measures is analyzed. The results show that by improving the drainage capacity to the planning level,increasing the water level,and improving the water-drought ratio at the same time,the comprehensive waterlogging risk decreases the most in the study area. Compared with the current situation,the proportion of high-risk area decreases by 100%,78.05% and 54.44% respectively when the rainfall intensity in the flood season occurs once in 5years,10 years and 20 years,and the proportion of the low-risk area decreases by 72.96% when the rainfall intensity in thr flood season occurs every 3 years.