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In face of the problems that arose from the teaching reforms of polytechnic schools, we have applied action research approach in this article. With the aid of the quality courses and teaching resources, we have put into practice the teaching methods based on Problem-Based Learning (PBL), analyzed learning results and reflected on it. As a result, we believe such a way of teaching is definitely significant to improve students' ability to learn. However, the method is challenging for both teachers and students.