Abstract: In view of the characteristics of the product design under networked manufacturing conditions, the importance of customer satisfaction index (CSI) is analyzed in product design. The CSI is applied to the negotiation mechanism in the circumstances of collaborative design. According to the design requirements in the collaborative design circumstances, the CSI system is analyzed with a mathematical model developed. Moreover, the multi-agent technology is introduced to develop a negotiation agent model and the CSI based negotiation process is studied. Combining with the enterprise actual demand, the CSI in the negotiation process for collaboration is evaluated through training and simulation by using BP neural network to reduce artificial factors so as to improve the reliability of evaluation. At the same time, the results verified the reliability of CSI evaluation based on BP neural network.