With the advent of the internet era，the extensive application of new media speeds up the transmission of information，and expands the dissemination scope，at the same time，the environment of the information dissemination becomes more complex.So it has became a very important course for enterprise public relation practitioners to learn，how to occupy the dominate position in such a complex environment of the information dissemination，and how to make full use of the advantage of new media information dissemination to solve the crisis when negative public opinion events appear. This paper based on the case study as the main research method，supplemented by case analysis and secondary data analysis.To take the“Coca-Cola with chlorine”incident as an example，analyses the characteristics of network transmission after this negative public opinion event，as well as a series of measures was taken by the Coca Cola Co. Ltd （Shanxi，China），which is the main subject of this event，in the development of the event，and finally make some suggestions of enterprise network crisis public relations strategies in three aspects，that is when to publish enterprises information，using the network media flexibly and establishing the crisis early warning mechanism of enterprise.