Abstract:Since the concept of "smart city" is put forward, research and practice on the "smart city" have been carried out all over the world. Many cities in our country also began to carry out the construction of "smart city". It has been regarded as an important means to change the mode of development and to promote sustainable development. In the process of building a "smart city", new technologie have made considerable progress and application, including network, cloud computing, big data, mobile Internet and Internet plus. In this paper, based on the analysis of the concept and characteristics of the "smart city", the ideas and concerns of the mapping geographic information department on the construction of large scale spatial and temporal data and cloud platform have been introduced. Combing with the overall framework of the "smart city", key technologies involved have been analyzed. Setting the construction of "smart Linyi" as an example, basic situation, main contents, objectives and tasks, implementation progress and other aspects of the implementation have been introduced in detail. The important roles which have played in the construction of "smart city" have been summarized. "Smart city" construction is a complex project. It should be suitable for local reality, and can effectively solve local problems of local construction.