The problem of praxis to a large extent causes the crisis of public administration theories. Action theory paradigm, as an epistemology that attempts to bridge the gap between research and practice, has been introduced into public administrative research. However, the current research on the epistemology of the action theory paradigm and its characteristics in public administration is insufficient. The details of operational methods are emphasized, while the specific characteristics of this epistemology are blurred. In this regard, the design of methods does not always match the epistemology or administrative research questions. This problem gradually becomes prominent. It hinders the development of action research in China. Focusing on the basic assumptions of theoretical praxis, this paper reviews the epistemological logic of action theory paradigm and compares its differences from positivism. This review will clarify some basic guidelines for following action research.