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This paper takes the Huangqin Reservoir irrigation area in Zhongxian County as the research object, and uses the terminal water flow calculation system to measure the water flow at the end of the canal system in the irrigation area. After calculation, the terminal water flow of the final canal system in the Huangqin Reservoir irrigation area after water-saving transformation is 0.053 per ton, which is lower than the farmers’ water tolerance of 0.355 per ton. The results show that the water flow calculated by the terminal water flow calculation system is feasible. However, in the actual implementation process, it is still necessary to continuously adjust and optimize the agricultural water reform measures to promote the development of high-efficiency water-saving agriculture.