The purpose of the study was to evaluate the effects of cooperative physical activities on social interactions of children with autism spectrum disorder (ASD) in China. Cooperative physical activities include procedures such as peer selection, peer practice, group task completion, and an interdependent group contingency. The intervention took place during inclusive physical education (PE) classes. Generalization of interactions with peers was evaluated during free play. Three preschool boys (ages 4-5 yrs) with ASD participated in the study, which used a multiple baseline design across the participants. Results indicated that the procedure effectively increased the frequency of appropriate peer interactions for all three children in the PE and free play settings. Although the frequency of inappropriate interactions increased after the intervention in both settings, the proportion of inappropriate interactions relative to appropriate interactions decreased for two children in the PE setting and for all three children in the free play setting.