3) Water production function parameters are different with time-domain and geographical variability [14]. Due to drainage conditions, crop water production function research in China has just started, so, the accumulation of data is limited, and the time-domain variability of function parameters is still needed to further studied. In addition, goals of farmland drainage from the single-objective indicators of the red line of food safety to the direction of a multi-objective control, such as taking into account ecological, environmental, regional equity [13] [20] [22] . Therefore, it should be taken ongoing experiments of farmland drainage.