Based on the confidentiality and efficiency of arbitration, the dispute resolution method is often agreed as arbitration in the contracts involving private equity funds. The investment process of private equity funds often involves multi-layer nesting to avoid regulation and infringement of investors' rights and interests. Such infringement cases involve joint infringement by a majority of people, and it is difficult for investors to claim their rights through infringement lawsuits based on the exclusionary effect of a valid arbitration agreement on jurisdiction in the event that investors have signed a valid arbitration agreement. Due to the relativity of the arbitration agreement, the arbitral tribunal cannot break through the validity of the arbitration agreement to pursue the liability of other joint infringers when accepting the relevant case, and cannot resolve the dispute at once. If the validity of the arbitration agreement can be extended to other joint tortfeasors in the private equity fund, it will not only facilitate the investors to claim their rights and interests, but also improve the efficiency of dispute resolution.