The transition from experience-based teachers to expertise-based ones has marked a significant phase in the history of human education. The conceptive transition from the general "occupational ethics" of teachers to "professional ethics" is actually an important aspect of the transition from experience-based to expertise-based teachers. The establishment of teachers' professional ethics bears the same historical inevitability as the movement of teachers' professionalization. Complying with this trend, we ought to promote the establishment of teachers' professional ethics specifically in view of the improvement in their living conditions and professional development.