During the epidemic prevention and control period, in order to implement the Ministry of Education’s requirements to suspend classes, but not suspend learning and teaching, colleges and universities in various places have made full use of the advantages and functions of "Internet plus education" to complete large-scale online course construction, teaching organization and supervision management in a very short time. In view of this, this paper obtains the mobile teaching platform data of special University for nearly 40 days, completes the cleaning,extraction, classification and summary operations, and objectively analyzes the online teaching situation of the University during the epidemic period. Based on the characteristics of data, this paper puts forward four teaching behaviors of online teaching, and formulates the supervision standard of "eight observation points" around the four teaching behaviors of online teaching, so as to provide reference for the evaluation of online teaching behaviors of similar colleges and universities, as well as for the supervision of online teaching in colleges and universities.