Owing to the outbreak of COVID-19, the opening of spring semester is postponed, but teaching is not suspended, which requires teachers to utilize the network platform for online teaching. How to ensure the quality of teaching and learning has become a big challenge. Based on the online questionnaire platform "www.wjx.cn", this paper analyzes the students after six-week online course. The results show that students are basically satisfied with online teaching, network stability and platform ease of use are the main influencing factors of online teaching effect. In addition to reasonable content arrangement and skilled platform use, teachers should use online real-time assessment to maintain students' attention and enthusiasm. In addition, the duration of online courses should be shortened appropriately. These research results can provide data support for the adjustment and improvement of online teaching in the later stage.