Virtual enterprise is one of the organizing forms in knowledge times, and with technology developed increasingly it shows up. As enterprises of knowledge denseness, knowledge labor is the basic sort, and knowledge, information and intelligence become the most precious strategic resources, intelligence asset of enterprises become source of profit. As knowledge management effective management of knowledge labor、effective management of strategic resource and effective management of intelligence asset become only choice. It becomes the only choice of the virtual enterprise to manage knowledge labor, strategic resource and intelligence. This paper tries to explain the importance of knowledge management to virtual enterprises, and explain virtual enterprises that only built knowledge management model oneself to adapt to history development.