At present, our country pays much more attention to developing the vocational education. On base of such a background, the research on improving the learning level of vocational students has a great significance in theory and practical application.This paper fully discusses the teaching strategies of PBL so as to help the undergraduates of vocational major enhance their abilities of learning level and solving problems. Meanwhile this paper elaborates relative theories including philosophy and psychology of learning. Taking the two typical modes of PBL---Learning by doing and Collaborative Learning which are based on CBR, we carried out the practice of teaching design and assessed its effectiveness. |