Abstract: The communication between experts and public in the epidemic has once again obtained attention in academic, especially the conduct of science, technology, engineering and mathematics (STEM) students have not met the expectations of the community for professionals. In STEM education, professional literacy provides students with the ability to integrate into the social context as an expert. However, it turns out to be inadequate for the relationship between ethics and professional literacy in STEM education, which leads to the contradiction between students' professional identity and social identity, as well as between the utilization of expertise and social knowledge. From the perspective of moral competence, the lack of the social value dimension in professional literacy can be reflected. STEM students will return to local society from expertise system and therefore respond the emerging and emergency affairs better in science and technology, due to the splits in community, knowledge system and identity are restored by competence intention, competence knowledge and competence skill.