The study was to explore the effect of social skills program with the multi-media and peer tutoring for teaching students with mild intellectual disabilities in an elementary school. The multiple probe design across subjects of single subject experimental design had been adopted. The two students with mild intellectual disabilities in elementary school and each three peers in class participated the study. There are two units in the study, the first one unit is "cooperation skills", and the second unit is "game skills". Major consequences of this study showed the immediate effects and the maintenance effects in cooperative skills and in game skills.