Objective: The present study was aimed to determine the effectiveness of psychological immunization program on pessimistic attribution style in boy students with dyslexia.

Materials & Methods: In this quasi experimental study, pretest and post test design with control group was used. Thirty boy students with dyslexia were selected randomly from Learning Disabilities Centers in Isfahan City .They were assigned to experimental and control groups in equal (15 individuals in each group). Their intelligence quotient and learning ability were measured by Raven Intelligence Progressive Matrices and Learning Test respectively. All students answered to Children Attributional Style Questionnaire (CASQ) before and after training sessions. Experimental group participated in 10 weekly training sessions (twice a week each session lasts for 60 minutes) and received psychological immunization program.

Results: The results of analysis of covariance showed that psychological immunization training program has significantly (P<0.001) decreased the pessimistic attribution style of experimental group in comparison to control group.

Conclusion: It seems that the psychological immunization intervention can be considered as an educational and rehabilitation program and lead to modify pessimistic beliefs of boy students with dyslexia.