The global warming has intensified the contradiction between the water supply and demand.Based on the analysis of the characteristics of the precipitation and runoff in the watershed of Weihe river,an evaluation model was established which is used to simulate the surface flow and ground water runoff with the consideration of the runoff yielding and water balance.According to the different kinds of climate scenarios,the responses and variation of the water resources to climate change were analyzed.Based on the actual social,environment and economic development of this region,a reasonable proposal for water resources use is given.