Unlike other PX incidents, the Maoming PX incident in Guangdong province has attracted widespread public attention for its offline protest and modification of the online PX Baidu entry. Linkage in the media and public opinion in the process of derivation, PX Baidu entry modify event participation main body of the psychological cognition, psychological structure is influenced by the media, and present a youth group “micro political psychology” generalization tendency. This article through to modify event PX Baidu entry feld investigation, with the SPSS statistical software analysis, found the youth group “micro political psychology” evolution process with the events of medium build, such as restructuring and identify associated scenarios, and have emotional depression, geographical radiation attenuation and cognitive features such as group differentiation; Under the role of media, micro-politics psychology is also constantly confronted with risks and hidden dangers such as discourse con?ict, media power difference and disorder of clusters, which affect the stability of the online society and even the actual social and political order. Based on this, this paper tries to put forward the media intervention measures of “micro-political psychology” of youth groups from the perspective of communication synergy.