Vocational college teachers are expected to improve their professional ability and teaching with the system of enterprising practice which helps with the construction of bi-professional teachers. However, a survey shows that teachers are usually confronted with their identity dilemma. On the one hand, teachers cannot find a proper position so that they do not know who they are. And on the other hand, most enterprises regard teachers as neither staffs nor apprentices. From the viewpoint of national policy designing, teachers need to embed detailed contents of practice in their curriculum, and enhance the school-business cooperation.