The intervention and regulation between sovereignty and power of Michael Foucault's bio-politics is a kind of political technology. After the 911 incident, there was a variety of perspectives concerned about war in the world. Thus, this article attempts to examine these perspectives from the concept of bio-politics. How to intervene and regulate when facing war in the perspective of bio-politics? This article intends to demonstrate the concept of ”the war of justice”, and then discusses the relationship between war and people, in order to figure out how to achieve the legitimacy of war.