Polymer processing is an advanced course for all of polymer engineering students. This course involves the integrated knowledge among rheology, mechanics of solids, transport phenomena, polymer physics, and chemistry of polymer , and it also delivers the students how to identify and solve the problems detected during manufacturing process. One problem that had been observed every academic year was the polymer engineering students could not integrate the knowledge of basic courses and adapt them for polymer processing course. This gives rise to that the students can not identify the problems detected during manufacturing process and are incapable of providing the appropriate solution for such problems. In this academic year, I used the PBL approach to improve the effectiveness of the course as well as the learning performance of the students.