Introduction: aggression and anxiety are the main trait of externalizing disorders, providing untreated it leads to negative effects on individual and social relationship specially in adulthood Therefore, this research investigates the influence of painting on aggression and anxiety among male students (8-9 aged).
Method: This study is a quasi-experimental study with pre and post- tests. Thirty male students (8-9 aged) who were obtaining scores higher than cut-off in Conners' parents form questionnaire were selected, and then they were assigned randomly to the control and experimental groups. The experimental group received techniques of painting therapy for ten treatment sessions (45minutes for each session). The aggression and anxiety were measured at the beginning and at end of therapeutic session, utilizing the Spence Children's Anxiety Scale and Children's Inventory of Anger (ChIA). Statistical analysis conducted by analysis of covariance.
Results: There is significantly difference in scores of pretest (53/2±41/131) and posttest (87/114±239/7)  aggression (p<0.001, F= 28.313) and in scores of pretest (27/80±587/5) and posttest (93/75± 497/6) anxiety (p<0.001, F= 15.698) between elementary school boys in pre and post-test.
Conclusion: Findings indicated that painting therapy has effective in improving behavioral problem such as externalizing disorders in elementary school. So, it can be utilized as the therapeutic interventions for decreasing behavioral problems in children.