Abstract: With the monthly precipitation data of 44 meteorological stations in the Jinsha River Basin, the five-year moving average method, Mann-Kendall method, the Kriging and spatial distribution were used to analyze the temporal and spatial distribution characteristics of precipitation and its variation trend. The results indicate that the annual and the non-flood season precipitation shows an indistinctive increasing trend, while the flood season precipitation shows an indistinctive decreasing trend; the annual precipitation is unevenly distributed, mostly concentrated in the flood season (from May to October) that accounts for 89% of the annual precipitation. The spatial distribution characteristics of precipitation is gradually increasing from upstream to downstream in the basin. The spatial precipitation distribution in the basin is significantly different, which shows an increasing trend in the river source area and the midstream, while a decrease trend in the downstream.