Based on the hourly precipitation data of 9 rainfall sites from 1989 to 2018,the Mann-Kendall trend test method and the anti-distance weight interpolation method were used to analyze the number of days of rainfall in different magnitudes on the annual,seasonal and monthly scales.The results showed that：（1）in the past 30 years,the proportion of light rain,moderate rain,heavy rain and excessive rain days in Pingjiang basin was 67.71%,19.90%,9.17% and 3.22% respectively.Rainfall days were mainly light rain,and moderate rain,heavy rain,excessive rain days with seasonal distribution were concentrated in spring,spring,spring,summer,and light rain,moderate rain,heavy rain,excessive rain days of the month characteristics were concentrated form January to June,February to August,March to August,May to August.（2）The spatial distribution of rainfall days in each magnitude:the number of light rain days mainly concentrated in the southern part of the basin,the number of excessive rain days mainly large in the was south and north,The number of moderate rain and heavy rain days with spatial distribution characteristics varied greatly.（3）According to the analysis of Mann-Kendall trend,the number of light rain and moderate rain days showed relatively active on the monthly scale,while the number of light rain and moderate rain days in November showed a significant upward trend,while the number of heavy rain and excessive rain days did not significantly changed.It can be concluded from the results that:for the prevention and control of river basin disasters,more attention should be paid to natural disasters caused by heavy rains in the northern part of the basin in May and June;for water resources development and utilization,the main focus should be paied on the period from September to December.The research is of great reference value to the research on flood prevention and control,soil erosion control and weather change in the basin.