With the rapid development of Smart City, multi-source, different- structured and redundant big data has been well de-veloped. Technologies such as data excavation and decision analysis provide an opportunity for big data to transfer into data asset which is necessary measures for the intelligence and interconnection of Smart City. Besides, the paper described the concepts, data resource and technologies of data analysis of Smart City. Furthermore, it claimed the synthetic application of big data of wisdom city. What's more, it demonstrated the application status of big data in current key industries and an expectation of its future de-velopment. Finally, it provided proposals and ideas for a further application of big data of Smart City.%伴随智慧城市的发展，多源、异构、冗余的大数据应运而生。利用数据挖掘、决策分析等技术，实现大数据转化为数据资产，必将成为大数据时代智慧城市智能化、互联化的必要手段。阐述了智慧城市概念、智慧城市数据资源及大数据处理技术，分析了智慧城市中的大数据综合应用，阐明了大数据在智慧城市重点行业领域的应用现状，并对其进行展望，为未来智慧城市中大数据的深入应用提供解决方案和思路。
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