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Starting with the concept and connotation of urban eco-environmental water demand, this paper first analyzes the types and characteristics of urban eco-environmental water demand and explores the calculation methods of urban eco-environmental water demand from three aspects: domestic water demand, industrial water demand and natural ecoenvironmental water demand, then establishes a multi-objective allocation model based on ecological water resources system, and finally conducts an empirical study with Zhengzhou City as an example.It is predicted that the total urban eco-environmental water demand for the planning year (2020, 2025) will reach 1.032 billion m3 and 1.171 billion m3 respectively.The optimal allocation of water resources provides a theoretical basis for the rational use of water resources in Zhengzhou City.