Internet is of important use today. It is no exaggeration to say that we cannot live without Internet now. But it also has some bad effects such as making us suffer a sort of addiction. Some experts areconcerned that Internet is not suitable for the weak-willed ones because they may get addicted to the games and the like on the Internet. It cannot be denied that some contents on the Internet areimproper, which may corrode some people's mind. Furthermore, a long chatting on the Internet will have a bad effect on people's work, study and life.