This paper discusses the concept of smart construction site, summarizes the smart construction site's content and its core technology, and cloud computing platform's architecture is proposed in order to realize the construction site's smart management and control, and intelligence services. Mainly discusses how to effectively collect and use construction site's big data, meets the high efficiency of construction site's administration, business management, service applications needs, and gives the smart construction site's cloud platform framework, put forward the smart construction site's application system solutions, lists some typical applications, finally lookouts smart city's good prospects for the future.