This study first briefly introduces the overview of China's online travel industry. At the same time, it introduces the basic situation of China's current online tourism and puts forward the problems faced by the online tourism industry. Secondly, introduce the development history and current situation of Ctrip. Thirdly, through the PEST analysis, SWOT analysis and marketing strategy analysis of Ctrip. the core competitive advantages and disadvantages of Ctrip are analyzed and summarized. After that, according to the problems existing in online tourism, combined with the development status of Ctrip, it proposes the improvement and suggestions of Ctrip.com relying on the development of mobile Internet. Finally, summarize the main research issues and methods of this research, and provide suggestions for how Ctrip's online tourism industry will develop in the future, and further look forward to the development of online tourism. The conclusion of this paper is that Ctrip should continue to develop and seize the opportunity of rapid development of mobile Internet. It should rely on the innovation, integration and cooperation of big data, product and operation mode to enhance the online penetration rate of enterprises and industries.