Abstract: In order to maintain the precipitation law in Botou City and give a better suggestion of rainwater resources management, the local data of meteorology during 1961-2010 were investigated with the methods of distance average analysis, linear regression and coefficient of variation. The results showed that: the annual average precipitation was 582.72 mm in 50 years, and had a decreasing trend; about 72.0% annual precipitation concentrated in summer, however the summer precipitation also reduced in recent years, with a rainfall trend of -20.33 mm/10 a. Besides, the rain days decreased before 1980, but increased gradually later. According to the local rainfall characteristics of inter-annual and annual variations of rainfall, concrete measures on fully using the rainfall were provided, which would be benefit for making a scheme on optimal allocation of water resources in this region.