HJ*3/5 Customer knowledge is considered as one of the key strategic resources to gain the competitive advantage for enterprises. Understanding the meaning and the key dimensions of customer knowledge is the foundation to implement customer knowledge management (CKM). Based on the practice from a number of different industries, the paper proposed that customer knowledge should involve four key dimensions: knowledge about customers, knowledge for customers, knowledge from customers and knowledge co-creation. Meanwhile, the approaches to manage every dimension of customer knowledge in the enterprises nowadays are analysized. And based on this, the definition of CKM is described and the process of CKM is set up. The purpose of the paper is to provide a conceptual framework for understanding and implementing CKM in organizations to enhance the customer relationships.