Identifying the influencing factors of knowledge sharing is the key for guaranteeing supply chain to share knowledge successfully.Based on the supply chain with Stackelberg game characteristics,the decisionmaking behavior under three different cases was analyzed.On this basis of quantitative analysis,the influencing factors of the knowledge sharing in the supply chain were discussed.The results indicated that the key factors affecting the knowledge sharing are knowledge value,the profits of knowledge sharing,and the status of the enterprise in the supply chain.