According to the ecological restoration goal of arid aeolian sand channel, combined with the flood control, benefit and ecological regulation of reservoir, a multi-objective reservoir ecological operation model was established for studying the ecological operation of Yuecheng Reservoir. The study results show that Yuecheng Reservoir provides ecological water supply of 0. 277×10⁸m³ to downstream rivers in the low flow year, 0. 327×10⁸m³ in the normal year and 2. 66×10⁸m³ in the high flow year.