The inventory management in supply chain is one of the most important aspect of supply chain management. As the organization and the management mode of the enterprise in supply chain has changed, the inventory management in supply chain is different from the traditional inventory management for single enterprise. The effective inventory management in supply chain can improve the agility and more quickly response to the market. Considering the present problems in the inventory management in supply chain, it is presented that the performance evaluating principle and the evaluating index. This paper makes certain the rate of the evaluating index with AHP method. It is evaluated the performance of inventory management of supply chain through the illegibility synthesis judge method, and it is applied to an example.