Abstract: Based on the monthly precipitation data of rainfall stations in Jinzhong Area from 1958 to 2020,based on the flood records in historical documents,the occurrence law,frequency and the chain of floods are analyzed by using the methods of linear regression,Z-index and wavelet analysis. In the past 2382 years,the occurrence frequencies of flood disaster years,major flood disaster years and especially major flood disaster years in Jinzhong Area are 13.6%,2.7% and 0.9%. The frequency of flood is accelerating,and the phenomenon of flood chain is very significant. From 1958 to 2020,the precipitation showed a downward trend,with the largest decline in summer,arranged in a U-shape on the whole,and precipitation was the most in 1960s. The frequency of continuous waterlogging is 17.5% in spring and summer,25.4% in summer and autumn,and 4.8% in spring,summer and autumn. The main precipitation cycles are interannual 26 a,spring 24 a,summer 4 a and autumn 8 a.The rainstorm mainly occurs in July and August. The highest rainstorm frequency is Yushe,with an average annual frequency of 0.89 times. The rainstorm frequency in the trumpet mouth topographic area is significantly increased. Finally,the causes of rainstorm and flood are analyzed from the characteristics of underlying surface,landform,rainstorm characteristics,atmospheric circulation,Pacific temperature anomaly and Earth Day relationship in Jinzhong Area so as to provide reference basis for regional disaster prevention and reduction and water resources utilization.