Abstract: This paper aims to provide a theoretical basis and reference significance for the reservoir construction planning, operation management and reservoir water source prediction by studying the climate change characteristics of the YangMaowan Reservoir basin.Using the climatic data of the meteorological station in the basin from 1960 to 2017,the seasonal and interannual variations of temperature and precipitation time series in the reservoir basin over the past 58 years was analyzed by the method of statistics, anomaly analysis and Morlet wavelet analysis.The results showed that the annual average temperature of the reservoir basin was increasing at the tendency of 0.24°C every 10 years, especially the temperature increasing trend was the most significant since 2010. The annual precipitation had a weak downward trend with the tendency of 1.6mm every 10 years, but summer and winter was weakly increasing. The wavelet analysis of the temperature showed that the average temperature in the basin had the change cycles of 4 years, 10 years and 20 years, of which the strong significant period was 20 years . Precipitation had the change cycles of 4 years, 8 years and 22 years, and the period of strong significant period was 22 years. It could be seen by the wavelet transform coefficient map that the temperature of the basin would still show the high trend in the next few years, and the precipitation would be the trend of less.