The temperature, precipitation and runoff are the three key factors of climate and hydrology.It is of great importance to the development of agriculture and economy to analyze the changing pattern of temperature, precipitation and runoff.According to the temperature, precipitation and runoff data collected from meteorological stations and hydrological stations in the upper reaches of Yangtze River, both parametric and nonparametric methods were used to analyze the variation of temperature, precipitation and runoff time series.The possible association between climate change and the variability of water resources in the upper reaches of Yangtze River is investigated.As a whole, the temperature experienced a significant monotonic increase at the 5% level of significance during the past several decades.Precipitation also exhibited a slight upward tendency during the past several decades.According to the runoff time series in Yichang station in the period of 1890-2000, decreasing trend at the 10% level of significance during the past 111 years has been detected in the runoff of the upper reaches of Yangtze River, which decreased with a speed of about 7m3/s per year.As case studies, the hydrometeorological characteristics in the Minjiang River, Jinsha River and Chuanjiang Section of the Yangtze River were analyzed systematically.The response of characteristic of runoff in Minjiang Basin to temperature and precipitation over Tibetan Plateau was researched.The Mann-Kendall test was used to detect the long-term trend of runoff, temperature and precipitation in the Jinsha River Basin.Under the A2, A1B and B1 climatic scenarios, the runoff change characteristics in the Jinsha River Basin were analyzed, too.The long-term and periodic variation of temperature, precipitation and runoff are analyzed in Chuanjiang Section of the Yangtze River.