As a crucial component of green finance,green bonds facilitate the role of capital markets in supporting green and low-carbon development.The theoretical rationale for the existence of green premium in green bonds,whether it exists in practice,and what factors influence it are important topics.This paper aims to address these three questions by systematic reviewing relevant literature on green bond premiums.The research systematically summarizes the theoretical mechanisms underlying the existence of the green premium of green bonds,discusses the debates surrounding their existence and causes,and categorizes the factors influencing green bond premiums.The findings provide valuable insights for enhancing the development and research of China's green finance system.