Abstract: A hybrid teaching mode of "online self-study+offline case study+challenging training design" based on SPOC is proposed to aiming at the problems existing in the traditional teaching of the Digital Communication Principles Course, such as abstract theoretical knowledge, weak comprehensive design of experiments, and difficulty in mobilizing students' enthusiasm for learning. In the teaching implementation, the case driven curriculum mind map was introduced, the online teaching resources were reconstructed based on SPOC curriculum, and the organic integration of online and offline courses was realized by combining the teaching tools, such as Mu Classroom and Superstar Learning. Finally, the multi-level and challenging experimental projects were designed. According to the course diagnosis and questionnaire, the average score of students' evaluation on the improvement of courses and ability points is more than 9 points, which has a good teaching response. The students' learning autonomy and comprehensive ability have also been greatly improved.

Key words: digital communication, SPOC, online and offline, hybrid