The scientific analysis of wetland eco-environmental water demands is the important foundation for wetland management and protection. In the case study of Hengshuihu wetlands natural reserve in Haihe basin,we set up a 3-level ecological conservation target system according to the present situation in the study area,adopt classification and grading method,and select 8 indexes in evaluating and grading the eco-environmental water demands of Henshuihu wetlands,based on which the minimum,optimal,and maximum eco-environmental water demands are estimated,respectively. Analysis indicates that the Hengshuihu wetland water supply can merely guarantee the minimum level which confirms to the actual situation of Haihe basin basically. The result provides a scientific basis and support for water resource allocation and dispatch in Haihe basin,while the research method can be used as a reference for the computation of wetland eco-environment water demands in arid zone.