An enterprise resource planning (ERP) is an enterprise-wide application software package that integrates all necessary business functions into a single system with a common database. Its implementation is a complex process in terms of technology preparation and organizational change management. Although the importance of knowledge management (KM) in ERP implementation has been recognized, how to conduct knowledge management has not received deserved attention till now. The main objective of this paper is to develop a KM system to manage the knowledge of ERP implementation process. To accomplish this, the article first identifies the types of knowledge in ERP implementation. It then summarizes various KM activities based on a six-stage model. At last, it proposes a KM system that consists of cooperative working platform, consulting platform, individual KM platform, organizational KM platform, and knowledge transfer platform. This system can effectively manage knowledge and provide support for the successful implementation of an ERP system.