Since the end of cold war, Europe have been suffering non-military security issues, such as migration, competing identity, which attract attention of Barry Buzan and Ole Waever who are named for Copenhagen School. They observer the evolution of new security issues and work out a specific explanatory concept Societal Security and Securitization to analysis why does societal security come out and become a serious issue in European. The main tasks of this thesis is try to figure out what does Societal Security and Securitization work and how to use these conceptual tool to analysis European migration issue, which are the basis for further reflection. After that, this article will also adduce critical opinion to demonstrate the deficiency of the theory of Societal Security and Securitization.