Abstract: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 multidual developing phase. There are multilayer 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 “obligationstandardized” to “rightstandardized”, etc. Although there are so many turning, legal positivism has not been selfdestructed.