n order to study the formation and evolution of water resources in Jingtaichuan Irrigated Area, achieve an efficient and rational utilization of water resources and ecological environment protection in high lift irrigation area, the Mann-Kendall trend test and non-parametric Mann-Kendall catastrophe test were used to analyze the time-varying characteristics of precipitation and evaporation in Jingtaichuan Irrigation Area from 1960 to 2008. The results showed that:the annual average precipitation in the irrigation area was 185.49 mm, the positive and negative anomaly ranges of multi-year precipitation were roughly the same during the 49 years, and the periods of large and small precipitation presented periodically and alternatively. The annual average evaporation was 2554.25 mm, of which 31 years evaporation is lower than this value. The precipitation in summer was the largest, accounting for 57.4% of the annual precipitation, followed by autumn and spring, and winter precipitation is the smallest. Evaporation is mainly concentrated in summer and spring, accounting for 40% and 33% of the annual evaporation, respectively, and followed by autumn and winter evaporation is the smallest. There was no abrupt change in the annual precipitation in the irrigation area, and the annual evaporation decreased abruptly in 1972 and began to decrease sharply in 1974, with a decrease of about 481.4 mm.