In order to analyze the evolution of water resources in the Sanchahe upstream, the water source area of the Qianzhong Hydraulic Project, the conventional linear regression, moving average method, Pettitt method and Morlet wavelet analysis method were used to find out the trend, mutability and periodic multidimensional characteristics of the precipitation and runoff from 1963 to 2012. The results show that the overall changing trends of precipitation and runoff are not obvious, but the wet and dry years alternate frequently. Mutation test results show that all of the hydrological sequences have a mutation in the year 2003, but not significant. According to the Morlet wavelet analysis, all of the hydrological sequences can be found a change periodic about 14 years.