Abstract: CMOS inverter and transmission gate are the basic logic gate circuits in digital logic design and its application. They are also the digital circuits with which students first come into contact. Correctly understanding the inverter and the gate is the basis of learning other logic gate circuits. From the question existed in NMOS inverter to the formation of CMOS inverter and transmission gate, heuristic and discussion-based teaching method is applied in the course teaching. The process of problem solving is presented by guiding the students to analyze problems step by step. The practice results have shown that students’ interest in learning the course has been improved, and that the knowledge of context and the related knowledge of mutual relations have been mastered.