[Objective] To explore the construction method of sponge city in the principle of ecological water conservancy, in order to solve a series of water security problems, such as the shortage of water resources, frequent floods and deterioration of water ecology.[Methods] The scientific connotation of sponge city and its traditional construction methods were summarized, the limitation of small and medium scale rain management measures was analyzed, the prominent contradiction existing in the construction of sponge city was pointed out, and the feasibility and advantages of ecological water conservancy application in sponge city construction were put forward.[Results] Based on setting mission objectives, basic principles and overall structure, a series of key projects and non-engineering measures were put forward around the construction of ecological water conservancy support system of sponge city.[Conclusion] The application of ecological water conservancy theory to the construction of sponge city is a fundamental way to guarantee urban water security and to solve the urban water problems. The development strategy of ecological water conservancy should be established as the core of the sponge city construction.