The continuous acceleration of the development of urbanization in my country has also brought about the problem of an increase in the proportion of urban hardened areas, which is prone to floods during the rainy season. The concept of sponge city construction can effectively improve the city"s flood discharge capacity and at the same time achieve the purification of runoff pollutants, which has been gradually promoted. Based on the urban road design plan of Shanghai, this paper analyzes the four road design plans with the cross-sectional format and the green space of the concession area as the control indicators; evaluates the road design results through the evaluation indicators; and proposes optimization based on the sponge city construction concept Ideas. The research results of this paper can provide a certain reference for the optimization design of sponge city on existing urban roads.