Some people learn faster than others and some others have slower learning. This causes the latter group have problems with expectations of society. The aim of this study was to examine the effect of traditional games the development of transfer and manipulation motor skills in boys with mental retardation (13-17 years old) of Khorramabad. 20 students were randomly selected as statistical sample from 135 educable mentally retarded (EMR) students. Subjects participated in Ulrich gross motor

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... pment test as a pre-test. They were divided into control (N=10) and experimental (N=10) groups. The experimental group participated in intervention trainings (traditional games) for eight weeks (three sessions per week). Each session lasted 45 minutes. The control group had not this intervention. Both groups participated in the post-test. The collected data were analyzed by Mann-Whitney U test (α≤0.05). The results of study showed that four traditional games had a significant difference on three skills of Ulrich test (long jump, kick, and the ball rolling by hand below the shoulders). There was no significant difference between control and experimental groups in other nine skills of Ulrich test. It is recommended to use traditional games to improve motor skills in boys with mental retardation since factors such as training opportunities, age, and similarity of task components with motor skills of Ulrich test can lead to more effective training interventions on individuals' motor skills.