With the rise of positive psychology, forgiveness is getting more and more attention. In order to emphasizing the positive role of forgiveness as an important positive psychology concept in facing and dealing social conflict, forgiveness was defined as a broader and integrated way in this paper, and based on the definitions of interpersonal forgiveness, self-forgiveness and forgiveness-seeking. This paper clarified some major misundersanting of forgiveness, summarized the research progress and proposed the corresponding research prospects in the area.