[Purpose/significance] This article reviews the book Competitive Intelligence Analysis Methods and Applications, in order to make readers understand the theory, methods and practice of competitive intelligence in the era of big data.[Method/process] Based on extensive reading, this paper summarized and compared the existing Chinese and foreign works. Combined with theoretical research and project practice, this paper combed the development process of competitive intelligence at home and abroad, expounded new concept of competitive intelligence, and discussed the future trend of CI according to the changes in forms and user needs in big data era.[Result/conclusion] The book highlights the role of data in the chain of information processing, and emphasizes the methodology system characterized by data-driven; It breaks through the traditional competition theory and defines the new ideas of competition intelligence analysis based on value network; Based on the original analysis methods, a series of new methods for data collection, monitoring, storage, organization and analysis are proposed, which provides new perspectives, concepts, and methods for competitive intelligence practitioners to carry out work and theoretical research.