Abstract: The effect of global climate change on water resources of Jing-Jin-Tang region in North China was studied using basin hydrological model and the comprehensive evaluation model for the water resources utilization of the region,diagnostic analysis of historic data was made and the GCMs output of climate change scenarios in the future was adopted. The study includes the impact of climate change on water resources quantity and its temporal and spatial variation and on water supply,water demand and sectoral water deficit in the region. The possible economic loss due to climate change impact was estimated.