Keuliling reservoir which is located in kuta cot glie, aceh besar is one of the reservoirs that has a function as a provider of water for irrigation needs, supports food self-sufficiency programs and others. the reservoir area has limited volume of water so, the most important water-saving irrigation water should be done to determine the scheduling of the distribution of irrigation water to the area of rice fields. the purpose of this research is to develop a method that can be used to the calculation of scheduling and can be applied to the irrigation of the keuliling reservoir watershed in aceh besar. in this study, the genetic algorithm method was used to determine the optimization of the keuliling reservoir in the greater aceh district. from the analysis that has been done, the scheduling process carried out so far is 72 hours where the amount of water entering the rice fields is 1,038,211,600 liters and is wasted into the river by 257,788,400 liters. the best irrigation time