1. Communication difficulties: In the online teaching process, the communication between students and teachers may not be direct and timely enough, which may cause students to encounter difficulties in understanding some mathematical concepts or solving specific problems.

2. It is inconvenient to practice and experiment: Deep-rooted mathematics usually needs to deepen understanding and master relevant knowledge and skills by practicing topics, conducting experiments and simulations, and these activities may be limited in online teaching, such as being unable to conduct experiments or observe actual phenomena.

3. Unstable learning environment: In online teaching, students' learning environment may be affected, such as unstable network connection and equipment failure, which will affect students' learning effect.

4. Course feedback is not timely: In online teaching, teachers face a large number of students' questions and homework corrections, which will delay the feedback of students' questions and progress and have a certain impact on students' learning effect.