Abstract: Based on the daily precipitation data of Huainan from 1957 to 2017, we adopted trend analysis, Morlet wavelet analysis, Mann-Kendall test and sliding t test to study the interdecadal variation, periodic characteristics and catastrophic characteristics of summer precipitation in Huainan. The results showed that: (1) the interdecadal variation of summer precipitation in Huainan had an increasing trend; (2) the linear increase of the proportion of rainstorm was significantly higher than that of the rainstorm days and rainstorm amounts, and the probability of future extreme rainstorm was increasing; (3) there was a quasi- two- year oscillation of the main period of summer precipitation in Huainan, and there were 9, 18 and 32 years oscillation period in addition; (4) the summer precipitation in Huainan in 1967 and 2008 showed a partial mutation which was not obvious. In the future, the precipitation and the extreme intensity of heavy precipitation along the Huaihe River will increase, which will bring challenges to flood control and agricultural production.