With the continuous improvement of technology, economy and society, the driving force of new generation informatic technologies is able to develop smart applications and establish a new and sustainable city model. This paperexamined the key factors involved in the construction of the smart city projects, evaluated the benefits of construction, and predicted the development trend of the project based on theoretical ideas and documentations issued by the government. The paper found that (1) the

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... art city project is divided into three major fields and two relatively new concepts: smart government, smart economy, smart society, the new generation of informatics infrastructure, and the development environment of a smart city. (2) The key technologies involved in the construction of the smart city are the Internet of Things, cloud computing, mobile Internet, big data, geo-informatics technology, and artificial intelligence. (3) The construction of the smart city project will bring great benefits, not limited to benefits to investors, but improving citizen's happiness, resolving or mitigating urban problems, promoting economic development and sustainability, and pushing forward the development of related industries and their development. And the findings related the definition and application of the smart city project to its development trend and provided policymakers with effective information to guide the design and construction of their localized smart city project.