The Practical Course of mechanical drawing is the first engineering course for undergraduates. It is an effective carrier for the transformation of learning method, the expansion of thinking mode, the Enlightenment of engineering consciousness, the cultivation of scientific style of work and the establishment of practical spirit. It is a professional basic course supported by engineering application and practice, and its main characteristic is strong practicality. How to transfer the theoretical knowledge into the ability to draw and look at mechanical drawings and express the design intention freely is the main task of drawing course teaching. In this paper, teachers design teaching methods, ideological and political point into a reasonable teaching content. Teachers in addition to teaching theoretical knowledge, but also the spirit of craftsmanship, scientific rigor, hard-working and other spirit imperceptibly infiltrated into the teaching. This not only improves students’ professional quality and professional identity, but also impels students’ professional ethics and quality to a higher level. To achieve the goal of educating people in the invisible.