Abstract: Based on the data of field experiments in Changwu County, located in the west of weibei tableland, this paper deals with the relationship between corn yields and consumptive use of water. The preliminary studies showt1. There is a significant difference at 1 percent level for corn yields among different treatments of water supply.2. At various level of water treatments, there is a parabola relationship beteen yields and consumptive use of water.3. Under different fertility levels, the relationships between relative crop yields and relative consumptive use of water are identical, that is, Yr =-4.292+10.586Xr-5.293Xr~2 where Yr—relative crop yields Xr—relative consumptive use of water

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