1. It is disadvantageous for the students who have no computer in their home. It will be the trouble when they need the computers to do the homework or practice.
2. Computer using is the scary thing for some people, and they may hard to catch the teacher's pace or can not realize the teacher's lecture.
3. It is cost a lot of money and sometimes cost a lot of time and energy of the teachers to design a class toward the technology. Besides, electronic problem should be considered, cause computer system is not available everywhere. The books are sometimes more convenient and cheap.
4. Computers can not replace the teachers, it is only the assistant tool. Teachers are the most important role in the class after all. So teachers should apply computer assistant teaching properly.
5. It's harmful for the eyes to stare on the computer for a long time.
