Abstract: Machine Design Foundation is a professional course for subject of mechanical engineering or related majors, also an important links of mechanical courses studying. In the course of this lesson’s teaching, some problems are exist, they may discuss fuzzily or lead to wrong in practice. All that are summarized and analyzed in this lesson’s teaching. By doing that, the students can understand the knowledge deeply, and the course teaching quality can be effectively improved also, consequently, the students’ positivity and creative thinking can be trained.

Key words: machine design, pre-tightening force, pressure angle, tooth profile, axial force inside the centripetal force bearings