Based on the data of monthly precipitation in Tongchuan meteorology station from 1961 to 2013,the paper mainly used the main methods of Morlet wavelet and Kendall-Mann test to analyze the precipitation variation and trend forecast in Tongchuan.The conclusions are as follows the annual precipitation presents decreasing trend,and is concentrated in the spring and autumn.However,the precipitation showed an increasing trend in summer and winter;the typical years of abrupt change of precipitation in the whole year , spring, summer, autumn and winter is 1986, 1983, 1985,1983 and 1987 respectively, which indicated that precipitation in 1990s happened abrup; all of annual and seasonal precipitation took place wet and dry variations of multiple time scales.After 2013, the annual precipitation entered the period of too less, and it entered an obviously less-than-normal period in spring and autumn.While for summer and winter, the precipitation can be more.There is a main change cycle of 10 years in both annual and seasonal precipitation.