Smart cities use information and communication technology to sense, analyze, and integrate key information of the core system of urban operation to realize smart management and operation of the city, thereby meeting various needs including people's livelihood, environmental protection, public safety, and industrial and commercial activities Make intelligent responses to create a better life for the people in the city and promote the sustainable growth of the city. According to statistics, as of now, more than 500 cities in China have made a total of about 500 Or is building a smart city, which accounts for about half of the total number of smart cities created in the world. This text mainly introduces:. ['Essential conditions for building a smart city.', 'Current status of smart city construction in China.', 'The development direction of future urban construction.', 'The relationship between smart cities and sustainable development.']