This article focuses on the question why it is important to study the free speech in cyberspace for the future of the Constitutional Law. The author insists that this topic give lawyers, judges and scholars the opportunity for asking why free speech is protected in the Constitutional Law. Why does society need free speech? This is a complicated question. The Constitutional Law scholars in the United States have already started to research this field. With their help, the author challenged that free speech in cyberspace should not be the "Law of the Horse". The Most important question is why the free speech is in the Constitutional Law.