This article is about some legal sanctions against slander, libel in cyber space. Internet is regarded as the most participatory market place and speech-enhancing medium in the 21th century. Some argue Internet should be set free from legal regulations. But Internet has become a legal regulation, because it has a cyber violence to victims. Such as cyber slander, cyber slander, cyber libel. Freedom of speech also should be regulated by criminal law and so on. Sportsman and entertainer has become targets of cyber slander , cyber libel because many people watch them all day long and sometimes criticize their behaviors. Netizens denounce them just for fun, but the victims sometimes commit a suicide owing to the slander. In this article I suggest some methods of civil and criminal liability to the offenders and Internet Service Providers(ISP).