In recent years，social short video platforms have attracted a large number of users to participate by virtue of their mobility，real-time，interactivity，intelligence，and life-oriented，but problems such as misconduct of users，loss of control of gatekeeper’s behavior，massive infringement，and cyber-bullying have also become serious. From the perspective of user’s participation，this paper uses the network ethnography and second-hand data research method to investigate Tik Tok，a leading platform in social short video field of China. The study found that users get sensory gratification and pursue the sense of belonging through “browsing Tik Tok”，giving emotional expression and feedback to performers by “commenting Tik Tok”，constructing a stylized subculture circle group by “shooting Tik Tok”，inspiring creative motivation and seeking realization of gains through “promoting Tik Tok”. The user’s participation of Tik Tok has an impact on individuals，platforms，society and other levels. To solving existing problems，we can guide and govern social short video platforms from the aspects of subject mining，push mechanism，media literacy，rights awareness and regulatory model.