A sample of 648 college students completed Shyness Scales,SCL-90,Peer victimization Scales to investigate the mediating effects of paranoid ideation and peer victimization in the relationship between shyness and hostility.Results showed that:1) Individuals′ shyness level could positively predict hostility;2) Paranoid ideation and peer victimization played a multiple mediating role in the relationship between shyness and hostility;3) Besides,shy-ness was also associated with hostility through a chain mediating effect of peer victimization and paranoid ideation.