In order to identify the characteristics of Dong Zhizhen's precipitation and predict the trend of annual precipitation, the Mann-Kendall (MK) test and Morlet wavelet transform were used to analyze Dong Zhizhen's annual precipitation from 1959 to 2016. The result shows that there is a slight increasing trend of the annual precipitation in the Dongzhi Tablelandand there is a abrupt change in the annual precipitation, the starting years of which are 1962, 1970, 1985, 1995, 2003 and 2009 respectively, with the interval of about 10 years. The annual precipitation is mainly affected by the scale periodic fluctuation of 2, 4 and 8 years, and the first main cycle is 8 years.The annual precipitation alternates significantly between wet season and dry season in the whole time domain of the study.The annual precipitation with an eight-year cycle takesa cyclical pattern of rise and fall.