A questionnaire survey was conducted among 2137 college students from more than 10 colleges and universities in Zhejiang Province and Jiangsu Province. The data were analyzed by correlation analysis and moderated mediation model test. The results showed that group psychology such as emotional infection, depersonalization, silent spiral, relative deprivation, group polarization and action mobilization can positively predict network cluster behavior; The action mobilization of opinion leaders plays a mediating effect between emotional infection and network cluster behavior; Group polarization plays a mediating effect between the silent spiral and network cluster behavior; Group efficacy plays a regulatory role in the latter half of the intermediary process of group polarization affecting network cluster behavior.