Abstract: Objective In this paper,we introduce the concept of the smart city,summarize its developmentprocess,analyze the construction motivation and objective of the smart city in China and elaborate thesupporting technologies for the smart city.Then we propose a smart city infrastructure which is basedon digital city,the Internet of Things(IOT)and cloud computing technologies.Smart city will a-chieve comprehensive awareness and management of people and things to provide various intelligentservices.Smart city with mass sensors will continuously collect vast amounts of data.Big data insmart city also bring many problems and challenges.To deal with those big data-related issues,wepropose a strategy mainly base on the cloud computing and data mining.After that,we presente aframework for cloud platform and propose the suggestion of establish smart city operation center.Inthe end,we look forward to a bright future for the smart city.