公安具体行政行为与刑事侦查行为是两种不同性质的行为.由于现实中存在的问题,使得这两种行为的性质往往难以认定,导致行政诉讼受案时发生人民法院与公安机关的争议,影响行政诉讼法的正确贯彻实施和公安机关刑事侦查的顺利进行.本文拟从两种行为在理论上的区别以及实践中易于混淆的原因分析着手,提出了区分两种行为的方法. Because of the problems existing in reality, the nature of these two kinds of behaviors is often difficult to determine, leading to the dispute and impact of the people’s court and the public security organ when the administrative proceedings are involved in the case The correct implementation of the Administrative Procedure Law and the smooth progress of the criminal investigation of the public security organs.This paper intends to analyze the reasons why the two kinds of behavior are theoretically different and confusing in practice and propose a method to distinguish the two kinds of behaviors.