中文摘要：

相对于随机变量，用模糊变量描述市场需求的不确定性有时是一种更好的选择。传统上，可能性测度往往被认为是与概率测度平行的概念。然而，事实表明，在模糊集合论中正是可信性测度才扮演了概率测度的角色。供应链管理需要节点企业在产品供给能力与库存成本之间取得平衡，确定合适的产品供给能力是成功进行供应链管理的关键。基于可信性理论，提出了模糊需求下度量产品供给能力的概念，给出了计算产品供给能力（补给周期供给水平、产品供给率）的公式和算例，讨论了模糊需求隶属函数形状的改变对产品供给能力的影响。

英文摘要：

According to supply chain management, the balance between the supply capability of products and the cost of inventory should be achieved in enterprises at the chain. It is important to the nodded enterprises to analyze the supply capability of products. On the basis of the credibility theory, the concept that the supply capability of products should be measured by fuzzy demand was put forward, the formula to compute the supply capability and its practical examples were given and the elfects of changed membership functions on the supply capability in fuzzy demand were discussed.