Since the outbreak of COVID-19 in early 2020, universities have carried out large-scale online teaching prac- tices, and teachers and students have paid much attention to the methods, effects and attitudes of online teaching. Online teaching has become an important teaching method during the pandemic, which are different from the carefully-planned online courses from other times. This paper studied the online teaching practices of the business school of Chengdu univer- sity during the outbreak of COVID-19 with questionnaires on the situations of online teaching and learning for 49 teachers and 1,105 students. On this basis, this paper explored the teaching mode innovation for business majors, the new challen- ges in online teaching, and the reform paths for business teaching against the backdrop of the pandemic.