Focusing on the problem about“Last Penalty”taken by core manufacturer on components’ suppliers constrained by performance in supply chain, a multi-suppliers’ synchronization model based on secure multi-party computation is built. Considering two situations under independent decision and suppliers’ joint decision, their optimal decision is analyzed respectively. Through the Monte Carlo simulation methodology and numerical example analysis, the results show that the information sharing mechanism in supply chain based on secure multi-party computation can take joint decision while protecting suppliers’ private performance information undisclosed, and decrease the loss cost of suppliers and global loss cost of whole supply chain significantly, finally let the supply chain achieve Pareto improvement.