Abstract: Based on Eco-system theory and recent research on prosocial behaviors in class environment, the article defined and reviewed interaction between children with two groups——peer and teacher——both of them interact with children closely and have an important impact on their prosocial behavior, as two sub-ecosystems under the context of class environment. And it reviewed components which constituted such two sub-ecosystems. Finally, more emphasis should be put on dyadic interaction, the research way of interactional model based on observation as an alternative, and time variables affecting behavioral process

Key words: class environment, micro-system theory, interpersonal interaction, prosocial behavior