本文通过地中仪对不同地下水埋深种植地膜棉的灌水均衡试验，得出在棉花生长期内，其灌溉渗漏量及棉花利用地下水量的变化特征。在水量平衡分析的基础上，提出灌溉水的消耗主要为棉田蒸腾和深层渗漏。从节水灌溉出发，以试验中充分供水条件下的棉花为模型，建立棉花日耗水回归方程f（t），并依据棉花根系利用土壤水的能力，确定最佳灌溉湿润深度，通过对回归方程积分计算，制订出棉花不同时期的灌水定额。 In this paper, we test the soil moisture of cotton membrane in different depths of groundwater, and find out the changing characteristics of the amount of irrigation leakage and the use of groundwater during cotton growth period. On the basis of water balance analysis, it is proposed that the consumption of irrigation water is mainly transpiration and deep leakage in cotton field. Starting from water-saving irrigation, taking the cotton under full water supply as a model, the regression equation f (t) of cotton daily water consumption was established, and the optimum irrigation wetting depth was determined according to the ability of cotton root system to utilize soil water. Integral calculation of equations to formulate cotton irrigation quotas at different periods.