teaching and learning during the COVID-19 pandemic. In this paper the online teaching experience in

physics college in Beihang University during the pandemic is summarized and data from four surveys

and interview contents of students' online learning experience is analyzed. The results show that

there are significant differences in students' learning experi-ence ( such as the frequency of teacher-student interaction，learning pressure，etc.) between online and in-person learning which varied with the learning time. The interactive design of online teaching and the scientific evaluation are highly approved by students，that fully expect to engage in the mixed online and in-person teaching after retur- ning to school. This large-scale

online teaching practice is consistent with the basic principles of the first-class cur- riculum development in terms of innovation of teaching methods，improvement of learning challenges，and helping students achieve the high-level learning goals. The feedback from students also serves as  an excellent guide for the development of the first-class courses.