Objectivs: In "Self-understanding" model presented by Damon and Hart (1991), level of change and growth delay are emphasized and therefore psychological problems may be resulted from deficiency or delay in adolescent‘s reasoning about "self".

In this research the role of integration therapy in improvement of self-understanding of addicted criminal adolescents on the basis of promotion of self understanding level have been surveyed, supplementary goals of the research have been survey of role of integration therapy in improvement of self concept and self esteem of criminal addicted adolescents in five fields including general, family, social, physical and educational.

Method: The non- randomized control group pretest- posttest design, a type of quasi-experimental study, has been applied in this research.To survey meaningfully the difference between two averages, "t" test was applied for independent groups.The population of the research included the criminal adolescents of Mashhad Education and Reform Center. Sample volume of the research included 16 individuals (8 individuals in experimental group and 8 individuals in control group).To select samples, purposeful sampling method was applied. The research means were clinical interview of Damon and Hart, self concept test of Beck and self esteem test of Poup.

Finding: The results of coding of clinical interview in pretest stage indicate delay in level of the addicted criminals’ self-understanding change.

To survey meaningfully the difference between two averages, "t" test was applied for independent groups.

The results indicate that, integration therapy plays role in promotion of level of self-understanding change, self concept improvement and increase of addicted criminals’ self esteem.

Results: Hypotheses of this study confirm the effectiveness of integration therapy on self understandingimprowement,self concept and increase self esteem addicted crrminaladolescents shows.these resultstheor of spontaneous treatment denies.therefore, reform and security systems shoud do more to maintain and to punish offenders. Thu,s psychotherapy and counseling services in prisons and reform and education center should be expanded.