Abstract: This paper mainly deals with water delivery models in the irrigation sy stems.First,Crop pattern in the irrigation area was categorized into paddy and upland croes.Based on water balance and soil moisture simulation theory,the irrigation water delivery models both for paddy and upland croes were established.Secondly,the parameters in the models such as hydrometeorology,soil and croes were obtained through historic data analysis or field measurement.The studied models can be calculated in real-time basis,and can forecast and revise next irrigation schedule,cording to real data.Finally,the optimum real-time irrigation schedule were achieved.The optimum canal discharge and irrigation rotation schedule were also studied in the models.