Backgrounds and aim: Increase in addiction in the community and the plight of its people demand for improving the problems of addicts, indicate a need for individuals to interventions and training expertise. The aim of this study was to investigate the effectiveness of group selection theory on the quality of drug addicted life.  .  Methods: This study is an quasi-experimental design with pretest-posttest and follow up with the control group. The study population included: all addicted people who referred to ahvaz addiction treatment center in 2015. 50 addicts were selected by using of  available sampling and randomly divided into  two experimental group (number=25) and control group (number=25). The participants were completed the quality of life inventory in three stages (pre-test, post-test and follow-up after 60 days). The experimental group was received group training of the concepts of selection theory of 10 sessions of 90 minutes per week.Statistical data were analyzed  using of covariance(ANCOVA) analysis. Results: Group training theory led to a significant difference among pretest, posttest, and follow-up of quality of addicted people life (p <0.001). In this case, the post-test and follow-up, after controlling of pre-test score, the experimental group compared to the control group higher quality of life was reported. Conclusion: Group training of selected theory about the role of choosing a behavior, five senses  the importance of self control, the role of effective behavior, the way of need fulfilment, responsibility, self worth, Quality world, seven destructive behavior, seven caring behavior, faiure identification and success identification can result in increasing the quality of life for addicted people.