Background: Considering the importance of adolescence and in which identity formation occurs and effects of successful identity on adolescents Life expectancy, one common technique for reduction and resolving identity crisis is to use the reality therapy. Objectives: The present study investigates the effectiveness of group reality therapy approach in reduction of personal identity crisis with emphasis on Life expectancy for the future. Materials & Methods: This was a quasi-experimental study, which was carried out by pre-test and post-test with experimental and control group. The statistical population consisted of high school girl students of Mashhad in 2014-2015 educational years. Hefdahe-Shahrivar Girls’ High School was selected using convenience sampling method. From all grades of this high school, two first grades, one second grade and two third grades were randomly selected -totally 125 students-. 22 students who answered the personal identity questionnaire and received the highest score, were divided into 2 groups of 11 -experimental and control- using random assignment. The experimental group received 10 sessions of 90-min group reality therapy, while the control group received no therapy. After the completion of therapy, both groups answered the personal identity questionnaire again. Results: The results of ANCOVA test showed that group reality therapy led to reduction of identity crisis in the experimental group -01.0>p-. Conclusion: According to the findings, holding training workshops based on group reality therapy for high school students may reduce personal identity crisis with emphasis on Life expectancy for the future.

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