The COVID-19 pandemic has greatly impacted the education of international students. The authors taught a molecular biology course using the DingTalk platform for international medical students (IMS) in the autumn semester of 2020. We assessed the effect of this online teaching based on an online questionnaire and by analysis of the final examination scores. Our findings demonstrate that the DingTalk platform is a free, effective and convenient online teaching tool for international students. The students' feedback showed that most of them were satisfied with this live teaching with DingTalk. They considered who viewed that the questions used in the live classroom setting were helpful for their learning. There is nonetheless still scope to improve this online teaching mode for international students, such as providing more pre-recorded teaching videos for offline application and use of a virtual simulation experimental molecular biology course. We hope that our findings regarding the experience of IMS with this teaching mode will be of value to other academic faculty.