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The model of crop water product function can be used as the foundation in rational allocation of agricultural water resources, optimal irrigation schedule and quota management of agricultural irrigation water. In order to get the reasonable model and parameters of crop water product function for study area, the comparison was made among several models of the crop water product functions based on the data of remote sensing ET and yield for winter wheat. Here, four models of the crop water product functions for the whole growth period were selected such as linear model, parabola model, D-K model, and exponential model. At the same time, five models of the crop water product functions for different growing stage were selected such as Jensen, Minhas, Blank, Stewart, and Singh model. The results showed that the parabola model was recommended for the model of the crop water product functions for the whole growth period. The Stewart model was recommended for the model of the crop water product functions for different growth stages. The most sensitive stage to water-stress was heading stage, followed by flowering to mature stage, and the least by the seeding emergence to jointing stage. Therefore, in order to save water and increase water use efficiency, water demand in heading stage should be top-priority, while water demand in the seeding emergence to jointing stage should be decreased.