Abstract: To ensure the safety of water environment and sustainable utilization of groundwater resource, the severity of inferior variation in Jinghui Canal Irrigation District was pointed out, and the necessity to carry out regulating capacity of groundwater reservior was confirmed by analyzing characteristics of inferior variation of water environment since 1980s. Irrigation district was verified to possess ability for regulating capacity of groundwater reservior by water intaking condition, groundwater reservior, water source for reserve and reserve pattern. The regulating capacity of groundwater reservoir of each observation station was calculated through capacity drainage method, 6.46×108 m3 could be regarded as the maximal regulating capacity of groundwater reservoir, 0.281×108 m3 regulating capacity of groundwater reservoir per year. The results indicated that utilization of surface water should be intensified in Spring and Summer properly, Shiqiao and Jingyang stations should take precedence to reserve groundwater in view of larger regulating capacity of groundwater reservoir and water supply ability, and promote to realize “replenish channels by wells, conserve wells by channels”. All of these can not only reserve local groundwater resource, but also contribute to sustainable utilization of water resource, and ultimately guarantee eco-environment and cereals safety in irrigation district.