This article mainly studies the definition of third-party funding in international commercial arbitration, the challenges encountered and the disclosure system of third-party funding by arbitration institutions. Third-party funding in international commercial arbitration refers to the act of providing litigation or arbitration funds to the parties by a third party outside the case to obtain all or part of the benefits from the arbitration results. This is an emerging investment model, but due to the lack of legal regulations on this behavior, it will also bring new challenges to commercial arbitration, that is, the confidentiality of arbitration and the independence and impartiality of arbitrators will be threatened to a certain extent. In order to solve these problems, it is necessary to implement a series of arbitration rules and disclose third-party capital contributions, so as to promote the fair and just settlement of the case.