In the field of International Relations, very few scholars engaged in integrating “security” and “governance” eithe theoretically or empirically. This paper proposes to construct the theoretical concept of “security governance.” Empirically, this paper tends o elucidate the evolution of regional “security governance” in contemporary Southeast Asia. It attempts to discuss the significance of “ASEAN Security Community” proposed in the 9th ASEAN Summit of 2003 and analyze its implication to Southeast Asian security.