Abstract: The function of urban roadway is for vehicles to pass. The inspection well and drainage pipeline under urban roadway are used to solve the ground drainage problem, while the sidewalk almost only has the fuctions of allowing pedestrians to pass and separating vehicles and pedestrians. At present, the underground part of most sidewalks has not been effectively used. The paper analyzed the difficulties that needed to be solved by using the underground part of the sidewalk, and proposed an urban ecological sidewalk and green space construction method with composite irrigation and waterlogging prevention functions. Through the systematic design of storage and drainage layers, inspection wells, drainage pipes, infiltration irrigation pipes, etc., the organic connection among sidewalks, roadways and garden green spaces can improve the drainage efficiency of urban roads, and effectively store rainwater for plant irrigation to achieve the purpose of saving water resources.