The innovative operation technology of the Internet of Things helps to make cities more efficient,flexible and sustainable.Limited city budget and new investment are used to improve the operation efficiency of traditional city systems and provide reliable energy demand to meet the needs of a 24x7 service society and various Internet of Things-based devices connected to the power grid.Making use of available systems that can be integrated into other systems to build sustainable and efficient intelligent buildings,offices,hospitals and hotels;Implementing digital city management with the help of smart city technology.