The research on rainfall has great significance for the rational development of water resources, the improvement of ecological environment and disaster control in arid and semi-arid areas.By use of the monthly precipitation data from three meteorological stations (Fuyun, Aletai, Habahe) in Irtysh River basin from 1962 to 2013,the paper took Mann-Kendall method, the Morlet wavelet analysis method, the R/S analysis method, and other hydrological statistics method to analyze the variation characteristics and trends of precipitation.The result shows that the annual precipitation presents a significant upward trend at the three stations.The annual precipitation has the periodic characteristics of wet and dry with various time scales.The main shock cycles at three stations are 22a, 18a, 22arespectively;Hurst values show that the precipitation at three stations will have a overall upward trend in the future.The degree reorder of increase trend of annual rainfall from large to small is Fuyun,Aletai and Habahe.