In order to provide a reference for the interannual or longer-term precipitation in Lhasa, and to understand the background of climate change on precipitation, based on the annual precipitation data recorded 4 meterological stations in Lhasa during the period from1981 to 2010, methods such as anomaly, 5-year moving average, the trend coefficient, the Mann- Kendall and wavelet analysis were used to analyze the characteristics of precipitation in Lhasa. The results indicated that: annual precipitation increased in the past 30 years. Annual, spring and summer s precipitation of each stations in Lhasa showed an increase trend, winter precipitation in most areas were a decrease trend. The precipitation s mutation in Lhasa occurred in the late of 1980s. There was a significant 2-4 years and 3-5 years of frequency of annual rainfall. There was no serious dryness and wetness events occurred in Lhasa, most of the years were normal and small floods event was easily to happen.