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Abstract Introduction: one of the major problems is that inhibition effectevence the efficiency and dynamism children and adolescent was shyness. Shyness as a definition negative reaction to being with strangers or acquaintances. The major causes of shyness damaged or abnormal cognitive processing in children. Play therapy is One of the interventions use full at reduces shyness in children. The aim of this research was to investigate the effectiveness of play therapy cognitive - behavioral Maykenbam at the reducing shyness and social withdrawal. Materials & Methods: Method study with experimental pretest and past test at control group. For this purpose, 50 male students in the first and second grade elementary schools range malekshahy city in the academic year 90-89 were, the spatial sampling Multi-stage clusters were selected. Behavioral check list shyness as a research tool before and after implementation of the independent variable (play therapy cognitive - behavioral) was performed and then the data obtained using SPSS software and Using two levels of descriptive and inferential statistic approaches (frequencies, T-test and ANCOVA) were used. Findings: To evaluate the efficacy of therapeutic interventions mayknbam in reducing shyness and social withdrawal student elementary schools of Analysis of Covariance (ANCOVA) was used. He results showed that two groups in terms of before treatment no significant difference at scores shyness and social withdrawal. While after the intervention (play therapy myknbam) of was observed F (69.247) in levels. /05 are significant. The overall average score of shyness and social withdrawal based on behavioral check list shyness all the indicators, after play therapy cognitive - behavioral Maykenbam than before intervention , is significant (p<0/05). Discussion & Conclusion: Play Therapy Cognitive - behavioral Mayknbam at the treatment and reducing shyness and social withdrawal at students' elementary schools is effective.