Article 524 of the Civil Code, a brand-new clause in contracts involving others, is designed to safeguard the interests of third party, and there is a broad space for application and interpretation, but it also needs to be developed in practice and summarized in theory. In order to better distinguish it from other relevant systems, its concept selection depends on the clear sorting out of the contract system involving others. It is controversial in academic circles to introduce the system of intended subrogation to broaden the scope of application of this article. Since the code has already provided for the system of assignment of claims and performance by third party, there is no need to introduce it at present, otherwise it is easy to cause confusion and confusion in legal application. The consent of the creditor or the debtor is in principle not required for the third party involved in the interest, but the creditor’s rights and interests must not be harmed and the debtor must be notified. When it comes to how to visualize abstract legitimate interests, China adopts the practice of reducing the upper limit of the comparative law, and at the same time combines the practical cases of China to carry out typological qualifications. Subsequently, the rights and interests of third party shall be safeguarded by improving the right of subrogation, provided that the vested interests of the earlier rights holders shall not be harmed when the third party repays, especially the creditors in partial performance, so as to better apply Articles 531 and 700 of the Civil Code.