When we respectively talk about the research objects of practical and theoretical philosophy，it seems that Aristotle applies “Nature” to both the research objects. The world of human beings and the physical world are also involved in the research of “Laws”. Therefore，the thoughts of Aristotle are always regarded as the intellectual resources of “Natural Laws”，based on which we believe that human beings also have their own “nature” or essence as the principle to build the social orders. Because of this，we are involved in the arguments on the relations between “nature laws” and political legislation. This paper aims to explain how Aristotle uses the concept of “Nature” to analyze the practical philosophical text，so as to study the status of “Laws” in Aristotle's thoughts，and discuss its status in modern society：are “Laws” natural，or established by human beings，or neither？