Objective To explore the demographic risk factors of undergraduates' health-risk behaviors. Methods Total of 566 undergraduates sampled by convenience sampling were surveyed with the Adolescent Health Related Risky Behavior Inventory (AHRBI). Chi-square test and Pearson correlation analysis were used. Results The overall positive rates of the participants in Aggression and Violence (AV), Rule & Law Breaking (RLB), Suicide and Self-Injury (SS), Smoking and Drinking (SD), Health-Compromising Behaviors (HCB) and Unprotected Sex (US)...