Abstract: The aim of this study was to determine the optimum cropping pattern with adequate and deficit water supply for mid-size (100 da) farm in Harran Plain Firat Irrigation District. The best cropping patterns corresponding to water source capacities of 100, 80, 60, 40, 20 and 0% ; crop water demands of 100, 80, 60% were determined. The results of the study shows that even with very low water supply, it is possible to keep the farm income at high levels.