Abstract: The effects of water alteration on the yield of different wheat genotypes and stage were studied. The results show that water variation at the jointing stage has a great effect on the yield. Under the effect of dropping yield owing to drought, compared with that of the well-watered treatment, the common wheat yield shrinks 29.45% at jointing stage, but only 12.70% at grainfilling stage. Compared with that of the water stress treatment, the common wheat yield increases 42.83% after rewatering at jointing stage, while increases 22.29% at grainfilling stage. Among different wheat genotypes, the yields of Zaipeiyili and Zaipeierli have only a change of 8.76% and 4.38% after rewatering at jointing stage.