Abstract: The internet finance which is easy to induce financial risks is a significant innovation in the new era, the moral hazard of intermediary platforms and borrowers is highlighted because of the hysteretic nature of supervision and legal system. The book financial innovation, moral risk and Legal responsibility written by Zhuo Wuyang and Peng Jing stresses the moral hazard which is considered from the aspect of legal responssibility, this is a way to study internet finance.The internet finance is distinct from the traditional finance when it comes to the source of moral hazard, regulatory environment and so forth. Therefore, there should be more emphasized the principle of "Unity of responsibility and right", when considering the prevention of moral hazard from the perspective of legal responsibility; The sociality of responsible subjects is paid more attention to; The exemption of "failure responsibilty" is used cautiously.