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Under the condition of insufficient irrigation schedule, based on the field water balance model and crop yield calculation model, a multi-objective optimization model was put forward to optimize irrigation date and corresponding quantity of irrigation simultaneously. In the model, irrigation date and the quantity of irrigation water were regarded as optimization variables, and the mean maximization of years of relative yield of crops, minimization of total quantity of irrigation water during whole growth stage and minimization of years of relative yield variance were as the optimization objectives. The model and algorithm were verified by irrigation schedule optimization of corn. Compared with typical year method, the results showed that irrigation system based on years of rainfall data had strong adaptability and robustness, and to some extent, could be avoided due to irrigation date arrangement reasonable to cut or no grain yield problem.