Abstract: Questionnaires were designed to quantitatively analyze the influence of university students' classroom cyberloafing behavior on their academic performance. The results show that there is a threshold relationship between the time input and the academic performance of the network. The appropriate time of the network can help to improve the academic performance, but if the time is too long, it has a negative impact on the performance. University should strengthen the publicity and education to guide students to set up correct world outlook, outlook on life and values in the network environment, and form the ability of independent thinking and self-study.