摘要:Abstract This research has be study the counselling services effect on adolescence's mental health. Research method was experimental and statistical population were high school students in Ardabil State of Iran. From this population, 1594 adolescences were selected with quota sampling. GHQ, Rogers's Self-Concept and a short researcher questioners, used for data gathering. Information analyzed with ANOVA, Multiple Regression, x 2, t, r, r s and eta tests. Results showed that, girls mental health was very treated in comparison with boys and effect of counselling services on adolescence's mental health were different in various subtests. This research showed that is better to be consider the education and history of counsellors in selecting them by education organization.