Precipitation is one of the key factors to describe climate change.Catching the changing characteristics of precipitation can provide significant references for research on climate changing,decreasing disaster damage of flood and improving the accuracy of the rainfall forecasting.In order to figure out the changing rule of the precipitation,based on the monthly precipitation data of 30 years (1981~2010) in Jiansanjiang reclamation area,the change trends of annual and seasonal precipitation were analyzed by a linear regression method,mutation characteristics of annual and seasonal precipitation were analyzed by the Mann-Kendall(M-K)test,and the spatial variation characteristics was carried out on annual and seasonal precipitation by the Kriging interpolation.The results showed that:(1) In the whole,the annual precipitation in Jiansanjiang reclamation area showed a decreasing trend and there was a significant difference between inter-annual precipitation; For seasonal precipitation,it showed an obvious downtrend in summer and autumn and uptrend in winter however,almost no variation in spring;(2) The M-K mutation analysis showed that there was no obvious mutation point in the whole annual precipitation series,however,it showed a slight upward trend in the annual precipitation subsequence from the year 1981 to 1999,but it began to descend obviously after the year 1999; there were many mutation points in the seasonal precipitation series,which indicated that the seasonal precipitation varied significantly,and it declined more obviously in summer and autumn;(3) The spatial variation analysis showed there was an increasing trend in the annual precipitation series from the southwest to the northeast in the Jiansanjiang reclamation area,and the spatial variation characteristics of autumn and winter are well consistent with the annual precipitation,especially the autumn precipitation has obvious significant spatial differences,however there was weak variation relatively in spatial for the precipitation in spring and summer.