Abstract: Based on the background of country’s sponge city construction development plan,it is necessary to calculate the urban rainwater resource utilization potential to providing data support for the implementation of planning and construction of sponge city. In view of the existing problems of rainwater resource utilization potential calculation model,it proposes a scientific underlying surface classification system,sets up a calculation model of rainwater utilization potential for sponge city construction,and calculates the rainwater resource utilization potential of in Kaifeng city.It puts forward the detailed measure of city rainwater resource utilization.