Introduction: The purpose of this study was to compare the effectiveness of two interventions, concluding cognitive-behavioral therapy and nonviolent communication on externalizing problem of children 5 to 8 years. Methods: In order to achieve the objectives of the study, quasi-experimental one was assigned. The study population consisted of the children 5 to 8 years in Tehran, referring to the Comprehensive Psychiatric Center Group Atiyeh. The sample group consisted of 30 children with externalizing symptoms were selected through the targeted method.. Sample group was assigned to two experimental and control groups, including cognitive-behavioral therapy and non-violent communication. The experimental groups participated in their therapy sessions, while the control groups received no treatment. For collecting data Child Behavior Checklist (CBCL) by participants before, after and at follow-up treatment was completed. Results: Findings showed that there were significant differences between grades of children's externalizing symptoms related to 2 experimental groups compared with before and after the intervention. There was no significant difference between the grades of children in the control group who had not received the intervention. Also, we have founded that the behavioral methodology was most effective and useful on reducing internalized children's symptoms compared with the other 2 interventions methods. Conclusion: According to the effectiveness of those psychological treatments on reducing the children's internalized syndrome, it seems that their methods will be suitable for prevention and treatment of children's behavioral problems.