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In order to maintain habitats status and prevent the degradation of ecosystems, the ecological water requirement should be considered in the plannings, especially for the arid and semi-arid regions. In this paper the effect of the Planning for Protection and Utilization of Luyanghu Wetland on the ecological water requirement of Luyanghu wetland was analyzed. The results indicated that the ecological water requirement in the planning was far more than the actual quantity which will intensify the severity of the local water shortage without suspicion. At last it was advised to apply the method of ecological benefit evaluation to deciding the best feasible scheme for the best ecological benefit.