Abstract:With the continuous development and advance of society, a new generation of information technology is formed in more and more cities, and is fully applied for all walks of life in city to reach a smart city. But as the process of smart city continuous to accelerate, the requirements of urban rainwater drainage engineering are also continuously improved. According to the development status of drainage system at home and abroad, and the study and analysis of the key problems and drainage technologies, it is suggested to strengthen the exploration of the urban rainwater drainage points. Starting from the main trunk network, the free drainage is realized step by step in a city. The problems of section occupation in the drainage pipeline network of community are solved. The street aquifer is arranged to buffer the rainwater drainage. The drainage commercialization is realized by purchasing a public service mode so as to further form the rainwater drainage engineering construction of smart city.