Legitimacy is not only the basis of copyright, but also the cornerstone of the modern copyright system. It is also the logical starting point of the study of modern copyright theory. Since copyright was born , its legitimacy has always been criticized. In WeChat, copyright legitimacy is questioned once again. Because of difference originated from the WeChat and other forms of media, the breadth and depth of the question has a greater impact on the existing copyright. The demonstration shows that the path is similar to the previous copyright crisis, and the rise of the question can be answered by the adjustment of both theory and system. Re?ection on the copyright in the WeChat is not to overthrow the legitimacy of copyright, but to optimize the copyright system, which is grown with the civilization of human society, to get deeper into mind.