To investigate the relationship between the perceived social support of college students andonline aggressive behavior, and the mediating effect of trait anger on the relationship between them. Inthe study, 350 college students from Luoyang were selected as participants by random sampling method,and the relationship between perceived social support, trait anger, and online aggressive behavior werestudied by questionnaire. Results: (1) there was a significant correlation between perceived social support,trait anger, and online aggressive behavior; (2) trait anger played an intermediary role in the relationshipbetween perceived social support and online aggressive behavior.