Within the context of climate change,extreme climate events occurred frequently.By using climatic tendency rate,Kriging interpolation method,Mann-Kendall nonparametric statistical test,accumulative distance leveling,R/S analysis,the variation characteristics and trend prediction of extreme precipitation process in the target area were analyzed based on long-term(19792014)daily precipitation data from 21 meteorological stations.The results showed a decreasing trend on the extreme precipitation over the past 40 years in the Sanjiang Plain,which was mainly reflected by the precipitation intensity.Moreover,there were obvious mutations in CDD,SDII,and RX5 day.There was a significant spatial difference in the extreme precipitation variation trend.The percentages of sites with decreasing RX1 day,RX5 day and R99 p were 52.4%,61.9% and 61.9%,respectively.The total annual precipitation (PRCPTOT)was presented as increase in Northwest-Southeast and decrease in Northeast-Southwest'.According to the historical trend of the extreme precipitation index and the prediction of the superposition of the Hurst index,it can be seen that the future extreme precipitation index will present the rising trend in the future.These results can provide scientific basis for making full use of natural precipitation and predicting the influence of agrometeorological disasters in the agricultural area of Sanjiang Plain.