Abstract: The water deficits in various development stages and the whole growing season of winter wheat in North China under climate change scenarios are calculated based on the meteorological data, crop development period and soil hydrological data at 43 stations. The results show that when temperature rises, the water deficit status would deteriorate, the isolines of deficit might shift southward, the climate suitable areas of wheat would contract, the yield-reduction would become serious and the output values would lose, and also the production cost resulting from additional irrigation might increase.