Bullying or peers violation is one of adolescent`s truly urgent issue but it is not public discussion topic. We conducted a study in 3 different schools which began from 6th of October, 2014 to 13th of October, 2014. There are total 167 subjects aged between 13-18 were from classes of junior and senior- high at: Orchlon school, School of 1 and School of 13. We used 53- item Questionnaire consisted of 4 sections for our study. We concluded 98(58.7%) participants from School of 1, 26(15.6%) participants from School of 13 and 43(25.7%) participants from Orchlon school who were aged between 13-17 (M=14.7±0.1) which comprise of 84 (50.3%)male and 83 (49.7%) female in our study We assessed correlation of depression and bullying by linear regression. The result of it shows 1 more score of depression measuring scale-CES-D can rise score of Aggression scale 1 by 0.33 point and also it can rise score of Aggression scale 2 by 0.84 point. There is a positive correlation between bullying and depression which confirms high risk of bullying is associated with majordepression in significantly. (p value 0.000) The findings of the study reveals that high levels of bullying associated with high levels of depression.