Teaching ethics in the professional development of a teacher plays a very important role. Ethics is the study of human morality, and the education activities are conducted through internal enlightenment and external edification to guide students towards positive development. Pygmalion Effect means no matter the attitude towards others is positive or negative, it will end up having an effect on either others' behavioral or psychological aspect. Therefore, teachers can apply Pygmalion Effect on the students with expectations and caring, and through teaching activities to achieve the teaching goals.