中文摘要：

亲社会行为是人际互动中对他人、群体及社会有益的积极行为，是个体获得幸福感的重要途径。但只有满足个体自主性需要的亲社会行为才能提升亲社会互动中的行为实施者、行为接受者及旁观者的幸福感，促进个体间积极的人际关系。行为实施者通过自主动机增加幸福感；行为接受者一方面因接受实施者自主的亲社会恩惠而产生感恩之情，另一方面因自身自主性需要得到满足而获得幸福感；旁观者作为潜在的实施者和接受者，通过观察施．受双方的积极行为和感受，参与亲社会行为的传递。

英文摘要：

Prosocial behavior is the positive behavior in interpersonal interaction that can benefit other people, groups and society. Prosocial behavior is considered as a critical way to help individuals gain happiness. However, not all kinds of prosocial behaviors can prompt people＇s well-being. Only those prosocial behaviors that could satisfy individuals＇ need of autonomy might increase the participants＇ well-being in this prosocial interaction, and could promote interpersonal relationships. Specifically, the behavior agent can gain well-being through autonomous-motivated prosocial behavior; the recipient＇s well-being not only is influenced by agent＇s motivation, but also depends on the satisfaction of his own need of autonomy; and the bystander will participate in transmitting prosocial behavior forward after observing the behavioral and emotional outcomes in the interpersonal interaction as a potential agent or recipient.