Objectives:Recent years, the smart-phone usage has been rapidly increased. While it gave us many conveniences and be-nefits, the adverse effects also came to emerge and threatened individual’s mental health. Especially, its overusage in the adolescents can have substantial impact on their psychosocial development. We aim to evaluate the psychopathologies of the adolescents according to smart-phone addiction level, by using the Korea-Youth Self Report. Methods:We selected four high schools within Daegu, Korea. Among the smart-phone users, 276 subjects were enrolled. The severity of addiction was measured through ‘2010 Smart-phone Addiction Rating Scales’ guided by the Korean Internet & Security Agency. The psychopathologies of the subjects were evaluated with the Korea-Youth Self Report. Results:The total score of the Smart-phone Addiction Rating Scales and the total problematic behavior score of Korea- Youth Self Report showed a positive correlation(r=.412, p<0.001). The group with more severely addicted showed higher T-scores on the nine of eleven subscales of the Korea-Youth Self Report[somatic complaints(p<0.05), anxiety/ depression(p<0.01), thought problems(p<0.01), attention problems(p<0.001), delinquency(p<0.001), aggressiveness(p <0.001), inter- nalizing problems(p<0.001), externalizing problems(p<0.001), total problematic behaviors(p<0.001)]. Among the contents and situations of smart-phone usage, utilizing the smart-phone for Social Network Services(OR : 1.83 ; 95% CI :1.29-2.59) and situations of smart-phone usage like ‘in bedtime’(OR : 1.52, 95% CI :1.04-2.23), ‘at bathroom’(OR : 1.84, 95% CI :1.28-2.65) w-ere risk factors for high level group of smart-phone addiction. Conclusions:We suggest that smart-phone addiction level is related to compromised psychological well-being of the adolescences. Also, Specific purpose and situations of smart-phone usages are associated to smart-phone addiction level. In the future, if more obvious psychopathologies and risk factors are grasped, it may be helpful in screening and intervention of high risk adolescent to smart-phone addiction.