In the current study the researcher has studied the Psycho-social development of children with moderate mental retardation from residential schools. The pre-testing was done by administering the Behaviour Assessment Scales for Indian Children with Mental Retardation by Reeta Peshawaria and S. Venkatesan. After pre-testing Intervention Program was planned. Approximately five sessions for every item from each domain for each student from experimental groups of residential school during the period of 6-7 weeks were conducted. After the intervention Program post-testing was done by administering the same scales stated above. The results in consolidated manner indicated that except on domestic-social domain, on remaining five domains, viz., motor, ADL, language, reading-writing, number-time, and prevocational, overall the MMRs show poor performance at pretesting level. To lift them up from that level, the intervention has to be more rigorous. It has also shown that no significant gender difference was found as a result of psychological intervention