Legal positivism is one of the main legal genres in the 20 century. It can be divided into three phases: scientism (establishing phase), hermeneutics phase (justifying and improving phase) and multidual developing phase. There are multilayer turnings in its developing process, such as: from scientism to hermeneutics, from “the viewpoint of the villain” to “the viewpoint of the good man” and from “obligationstandardized” to “rightstandardized”, etc. Although there are so many turning, legal positivism has not been selfdestructed.