Three-River Source Area is situated on Tibet Plateau,which is very sensitive to climate change,especially to precipitation. Based daily precipitation data from 1964 to 2014 in Three-River Source Area,precipitation amounts,precipitation days,inter-precipitation periods at different levels were analyzed. The results showed that annual precipitation amount was 467. 48 mm in Three-River Source Area,increased significantly since 2000. The amount was dominated by high /moderate precipitation amounts,mainly due to changes from heavy precipitation. Annual precipitation day was 137. 83d,dominated by low /moderate precipitation days. The inter-precipitation period was 40. 06 times,dominated by inter-precipitation period of ≤5 d,accounting for 83. 55%. Data from 13 meteorological stations were collected,suggesting that the precipitation of Jiuzhi was most stable,rather not Tuotuohe. In addition,precipitation was one of primary limiting factors,according to the study of precipitation and production in Three-River Source Area. Occurrence periods of drought and light precipitation were consistent,indicating annual precipitation amounts and days were increased and > 5 d inter-precipitation period were decreased,relieving the occurrence of drought and its severity.