This paper explores the "Micro STEM" physics classroom teaching from the two aspects of pre-class design ideas and teaching links, and conducts an investigation on the teaching effect of students after class. The study finds that "Micro STEM" classroom enables students to understand and use the target knowledge better than traditional classroom, and students'interest in learning and classroom participation are higher. It is helpful to cultivate students'ability to discover and solve problems and sense of teamwork, and to improve students' core scientific literacy.