Abstract: Electrical experimental teaching is vital to the training of undergraduate students from the major of electrical information. Traditional electric experimental teaching adopts offline teaching mode, which plays an important role in cultivating students’ practical ability. During the COVID-19 epidemic prevention and control, the online teaching mode and virtual instruments were adopted to provide a new teaching solution for the traditional experimental teaching. The online and offline hybrid mode can combine the advantages of the two teaching modes, which can not only effectively train students’ skills of operating actual hardware instruments, but also mobilize students’ subjective initiative to carry out personalized innovative experimental projects. Harbin Institute of Technology (Shenzhen) has carried out a radical reform on 7 core experimental courses of electricity engineering, and adopted the online and offline mixed mode to improve the teaching effect. The teaching practice results with more than 1086 students participating in show that the online and offline mixed mode can significantly improve the effectiveness of traditional electrical experimental teaching. Online and offline mixed experimental teaching mode is a beneficial exploration and practice of electrical experimental teaching.