With the deepening of smart city construction, many cities have made full use of new technologies such as big data and Internet of things to release water logging maps and conduct real-time monitoring of urban waterlogging during the flood season this year. Relying on the numerical simulation model of urban flood, the Beijing Water Affairs Department released the waterlogging risk map to visually display the distribution of risk points and give corresponding risk avoidance tips; Ningbo, Zhejiang Province launched a ponding map to display the ponding information of low-lying sections and underpasses in the urban area in real time, and combined the ponding data with map navigation to facilitate the public to query at the first time... A ponding map with more complete points, stronger timeliness, more accurate content and more detailed classification helps improve the ability of disaster prevention and mitigation, and provides a reliable guarantee for the safe travel of citizens in rainy days. The construction of a smart city requires top-level design, and it is also inseparable from small details and micro innovations that can accurately solve the urgent problems of citizens. Application scenarios such as ponding map make urban governance more efficient and make cities more livable, which is an innovation in smart city construction. Due to the uncertainty of rainfall and changes in urban construction, some places have also dynamically updated the waterlogging risk points to better serve the public. From improving and refining the relevant prompt and warning work to reducing the adverse effects of extreme weather, to strengthening the prevention and control of noise pollution caused by municipal engineering construction, to issuing the "mosquito bite index" and the pollen allergy meteorological index forecast, to building a smart city, adhering to the problem orientation, and making full efforts to embroider from the needs of citizens, we can see the quality and feelings in the details. The "14th five year plan" and the long-term goal outline for 2035 put forward: "promote urban and rural development and governance model innovation with digitalization, and comprehensively improve operational efficiency and livability." The foundation of smart city construction is data. Only when the data is more, can the masses run less errands. In Beijing Economic Development Zone, enterprise clerks and residents can know where and how to do more than 1000 government services as long as they open their mobile phones to query the smart government map; In Shenzhen, intelligent signal control systems have been launched in some sections to realize the transformation from "vehicle watching lights" to "lamp watching cars", and greatly improve the traffic efficiency of main roads during peak hours; In Shanghai, many elderly people living alone in many communities have installed smart sensors to protect the health and safety of the elderly... These intelligent scenes have written vivid footnotes for digital enabling a better life. The construction of a smart city is a complex system project, which can not be separated from system thinking, but also requires continuous efforts and long-term efforts. Ponding map provides convenience for residents' life and helps prevent safety risks. Behind it is the interconnection of data in multiple fields, and the cooperation of water affairs, big data, transportation and other departments. This also enlightens us that to deal with various "urban diseases" with both symptoms and root causes, we need to strengthen overall planning and coordination to effectively improve the overall efficiency of urban governance. In addition, we should constantly improve the wisdom of urban construction and the people's livelihood. We should also plan in advance to deal with new situations and problems in the process of urban development. For example, how to avoid duplicate construction and improve the utilization efficiency of various resources; How to ensure data security and better protect personal information and privacy; wait. Only by aiming at the needs of the masses, making practical moves and seeking practical results can the achievements of smart city construction be continuously consolidated and better benefit the masses. "This is a city, so Sheng min