Abstract: Based on the annual precipitation data in the north of LiangShan city (GanLuo, YueXi, MianNing and XiDe) during 1961 to 2010, linear regression, trend analysis and Mann-Kendall Method were used to analyze the characteristics of precipitation trend and characteristics. The results show that yearly mean precipitation has an increasing tendency during recent 50 years, the change rate is 38.7 mm/10a (across α= 0.05 significant test). Analyzing the tendency of the annual precipitation change rate, there are less drought and more floods in recent 50 years. (Drought only occurred once in GanLuo in 1972.) Heavy rain has an overall increasing trend with the passing of years, and a significant increase from the north to the south. Through M-K test of precipitation, there are increasing trend of mutations of annual precipitation in GanLuo, YueXi and XiDe, a significantly decreasing trend in GanLuo.