Smart city uses information and communication technology to perceive, analyze and integrate the key information of the core system of urban operation, so as to make intelligent responses to various needs including people's livelihood, environmental protection, public safety, urban services and industrial and commercial activities. Its essence is to use advanced information technology to realize the intelligent management and operation of the city, so as to create a better life for people in the city and promote the harmonious and sustainable growth of the city. In 2009, Dubuc cooperated with IBM to establish the first smart city in the United States. By using the Internet of Things technology, various urban public resources (water, electricity, oil, gas, transportation, public services, etc. ) is connected to a community with 60,000 residents, so as to monitor, analyze and integrate all kinds of data, make intelligent responses and better serve the citizens. Dubuc's first step is to install numerical control water and electricity meters in all homes and shops, including low-flow sensor technology, to prevent waste caused by water and electricity leakage. At the same time, a comprehensive monitoring platform will be built to analyze, integrate and display data in time, so that the use of resources in the city can be seen at a glance. More importantly, Dubuc releases this information to individuals and enterprises, so that they have a clearer understanding of their energy consumption and a sense of responsibility for sustainable development. Based on the Internet, South Korea has built an eco-smart city with green, digital and seamless mobile connection. Through the integration of public communication platform and ubiquitous network access, consumers can conveniently carry out distance education, medical treatment and taxation, and can also realize intelligent monitoring of energy consumption of home buildings. Ibm20 10, IBM formally put forward the vision of "smart city", thinking that a city consists of six core systems related to the main functions of the city: organization (people), business/government affairs, transportation, communication, water and energy. These systems are not decentralized, but interconnected in a cooperative way. The city itself is a macro system composed of these systems.