Abstract: Taking the output from GCMs as the climatic scenario and applying the monthly water balance model and water resources comprehensive assessment model, the impact of climate change on the annual and monthly runoff, evaporation as well as the water supply-lemand deficit were studied.The results show that the most significant influence of climate change is located on the Huaihe River and northern part to it.The increase or decrease of annual runoff is determined by the variation of runoff during flood season.In future dunatic condition, the water deficit will be enhanced in the Yellow,Huai and Hai River.