Abstract: Experimental teaching is an important part of reform and innovation in universities. In view of the traditional method of experimental teaching and the impact of the pandemic on education, the online and offline synchronous process experimental teaching method of “signal analysis and processing” is proposed. Firstly, the literatures related to the experimental teaching of signal analysis and processing are reviewed in this paper, and then the experimental teaching methods and experimental learning methods are described in detail, with emphasis on the final examination of online and offline synchronous experimental course based on Rain Classroom. The proposed teaching method was successfully applied to experimental teaching, completed the transition from result-oriented assessment to process-oriented assessment, and realized the collaborative training of comprehensive ability.