Emotional control has traditionally been emphasized in Chinese culture. The primary purpose of the study was to examine the relevance of early affect to social functioning in Chinese children. A sample of children, initially at two years of age, and their mothers in the People's Republic of China participated in this two-year longitudinal study. At Time 1, observational data were collected on children's affect and maternal parenting in mother-child interactions. At Time 2, children's behaviors were assessed in peer interactions. In addition, data on behavioral problems were collected from parental reports. It was found that whereas positive affect positively predicted prosocial behavior, negative affect was positively associated with later behavioral problems. Both positive and negative affects were negatively associated with on-task behaviors. Finally, child affect might moderate the relation between maternal parenting and social behaviors. The results indicate the role of child affect and parenting in social and behavioral development in Chinese context. (Contains 3 tables and 1 figure.)