Teachers can't grasp the students' listening state, feedback the effect of listening in time, and manage students well in class. In addition, in the process of live broadcast, teachers can only connect one student at a time, so group communication cannot be realized, which limits the interaction and communication between teachers and students, and teachers can't adjust the teaching rhythm well according to the students' listening status.

2. Teachers lack effective control over students. Students with low self-control are inattentive in class, playing games, listening to music, watching movies, chatting, and even leaving the classroom halfway. Teachers can't stop it in time, which affects the teaching effect.

3. The advantage of face-to-face communication between teachers and students in traditional teaching is irreplaceable by network teaching. When surfing the Internet, students can't feel the encouraging eyes and smiles of teachers, and the communication with teachers is just "words".

4. The feedback effect after class is poor. The teacher assigned online work and asked the students to submit it in time. However, students' homework can easily be perfunctory, copied or completed with the help of search software. This kind of after-class feedback effect is invalid, and teachers can't find problems through students' homework and make teaching adjustments in time.