Abstract: Annual and monthly precipitation data from 132 stations of western China during 1958 to 1989 are used to do some statistical calculation. The characters of spatial and temporal distributions and stabilities for monthly precipitation are estimated. It is found that there is an abundance of monthly precipitation in southeast of western China and few in northwest. In the abundant precipitation areas and seasons, the precipitation is stable, but in the drought areas and seasons, the precipitation is short and unstable.