Climate change from 1981 to 2009 had caused measurable impacts on wheat yield in most of the zones. Due to increase in during GPw in the period, yield increased for winter wheat in Zone I, Zone II and Zone V of northern China by 13.3%, 6.5% and 0.4%,respectively. By contrast, yield decreased for winter wheat in Zone III and Zone VIII of southern China by 3.8% and 4.0%, respectively(Fig. 7). For spring wheat in northwestern China, yield decreased in Zone IV by 2.3% but increased in high altitude Zone VII by 5.9% due to increase in during GPw; yield increased in Zone VI by 2.6%due to decrease in during GPw.