Aim: The aim of present study was the comparing the sensation seeking, internet addiction and interpersonal trust of girls and boys student (Kharazmi University).

Method: The research sample was 120 students. Implemented instruments of this investigation were: The Zuckerman sensatoin seeking questionnaire (1978), Young internet addiction questionnaire (1998) and interpersonal relationships scale Rempel & Holms (1986) performed. The obtained data were analyzed by independent t test and multi-variance.

Result: In this research, it was found that there were significant differences between average of disinhibition and adventure seeking in sensation seeking of girl’s student comparison with boy’s student. Also, the average of loyalty in interpersonal trust within two groups showed a significant difference. But there was no significant difference between two groups in terms of internet addiction.

Conclusion: High disinhibition and adventure seeking of boys revealed that they tended to seek high level of stimulation in their lives and high loyalty of girls shows that they were more reliable than boys in their relationships.