Objective: This research examined the effectiveness of theory of mind training on improving cooperation, self-control and assertive in autistic boys 7-12 years old in Tehran. Method: Utilizing an experimental method with pre-post test design and control group, 12 subjects were selected and assigned randomly into experimental and control group. The research tool was 38 Theory of Mind Questionnaire and Gersham and Elliott social skill scale. Results: t-test analysis indicated that theory of mind training promotes cooperation and self-control but it does not promote assertiveness in -the autistic children.Conclusion: This study conclu des that theory of mind training may promote cooperation and self-control but cannot promote assertiveness.