"Nostalgia" is a unique human ability and phenomenon that has recently attracted significant attention in the field of psychology, leading to a substantial body of research. However, this topic has not yet garnered much attention from researchers in our country. Therefore, this paper aims to compile and review empirical studies on nostalgia within the context of interpersonal relationships. It introduces the evolution and characteristics of the concept of nostalgia, evaluates its various positive effects on interpersonal relationships, and examines its impact on romantic relationships. Finally, the paper offers new perspectives and potential directions for future research. It is hoped that this article will provide readers with a foundational understanding of nostalgia and inspire more researchers to engage in studies on this topic.