Objective: anti-social behaviors and aggression are among the most common causes of children and adolescents referred to mental health clinics, That seen many among individuals with mental retardation. For the treatment of mental retardation children'aggression have been proposed Several methods. Puppetry as one of these interventions, can be effective in treatment of aggression and behavioral problems in mental retardation children . The purpose of this study is to determine the effect of puppetry (with uv light) in reducing aggression of educable mental retardation students in primary school.

Materials & Methods: This study is a quasi-experimental study. In this study, 40 mental retardation students selected randomly through Tehran schools and randomly put in intervention group (20 cases), and the control group (20 cases). The intervention group exhibited puppet show (with uv light) seven successive sessions every day ( 15 to 20 minnutes) . the end of intervention mentally retarded aggression scale (B.D.GH) was done and data analyzed by paired t-test and independed t-test..

Results: aggression Mean of control and experimental showed no significant statistical difference in pre-test (p=0.999) but after the test, aggression mean of experimental group is significantly lower than control group (p<0.001). The aggression mean of experimental group is significantly in the post-test lower than pre-test is (p<0.001). Conclusion: This research finding showed that puppetry(with uv light) was effective on reduction of Aggression of Educable Mentally Retarded Students.

Conclusion: This study showed that the intervention was effective in reducing aggression and display dolls mental students was effective.