According to the principle of rainfall collection using, some slope field is left as rainfall collection area to provide water to plant area, and to decrease water deficit of wheat in plant area. The result shows, if the ratio of rafall collection area to plant area is 1∶1, the soil water condition of plant area will be improved obviously, single development of wheat in plant area will grow better, the yield will be increased by 51.38%, and WUE is raised 2.27 kg/(mm· hm²) compared with the check plot.