As a basic course in electrical specialty, Circuit Foundation has strong theoretical and professional characteristics. It is difficult for students to learn. Traditional teaching methods are mostly centered on textbooks and theoretical teaching, which is not conducive to the understanding and flexible use of knowledge points. It cannot promote the cultivation of students’ innovative ability. The online and offline teaching modes have changed the traditional classroom teaching mode, which can fully mobilize students’ learning enthusiasm and creativity. Enhance students’ interest in learning. In this paper, taking the course of “Circuit Foundation” as an example, the online and offline hybrid teaching mode is constructed, and the teaching design is carried out. The practice results show that the blended teaching method has achieved good results and is superior to the traditional teaching method. It is more conducive to students’ understanding and mastery of knowledge. The results can provide a reference for further teaching reform of the course “Basic Foundation”.