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China is carrying out the construction of sponge city vigorously. It is necessary to estimate the utilization potential of urban rainwater resources in order to ensure the implementation of sponge city planning and construction program. There are some problems in the existing calculation models of rainwater resource utilization potential. In view of these problems, we put forward a reasonable classification system of underlying surface, built a rainwater resource utilization potential calculation model suitable for the construction of sponge city, and applied this model in Kaifeng city, and put forward specific measures for the utilization of urban rainwater chain.