Abstract: Objective To analyze the differences in the evaluation of online teaching outcome of Peking University medical undergraduates at different learning stages and different learning weeks during the epidemic of COVID-19, and to explore effective strategy to improve the online teaching outcome of medical students.Methods From February 17, 2020 to March 15, 2020, 644 undergraduates in 2016-2019 grade majoring in five-year and eight-year clinical medicine, five-year and eight-year stomatology, five-year preventive medicine were selected as the research objects, who were in the three stages of medical preparatory, basic medicine and clinical medicine of Peking University and engaged in online learning. Questionnaire survey method was used to investigate the online teaching effect of students in different stages and learning weeks.Results Students from pre-medicine, pre-clinical and clinical learning stage have increases in their satisfaction. Meanwhile, the quality of communication with faculty decreases significantly(F=10.393,P＜0.01). With the advancement of online teaching and learning weeks, the communication between students and teachers has increased significantly, but student’ interest in learning has decreased significantly (all P <0.01).Conclusions The online learning outcomes of medical undergraduates vary with different learning stages and in different online learning weeks. It is necessary to adopt a targeted teaching method so as to improve the online learning outcome of students.

Key words: COVID-19 pandemic, Medical students, Online learning, Periodic evaluation