摘要:AbstractInvestigation of mental retardation and behavioural problems interaction is one of the behavioural science researchers’ inter ests. Aim of present study is to investigating of the efficacy of social skill education on aggression reduction in 14 -24 years old mild mental retarded girls. 50 mild mental retarded girls (more than 14 years old) in Shariati rehabilitation centre of Tehran wer e randomly selected and divided into control and test groups. Experimental tools included social skill educating programs bas ed on Lagraca model and Eysenck Aggression determination scale. Results showed that Social skill educating can reduce aggressive behaviours in mild mental retarded people.