This essay aims to reconsider and refine the concept of peace-building in light of practical and strategic interests of international peace operations. Peace-building generally refers to activities to solidify structures for stable peace in conflict ridden society. As it is understood to include so many divergent activities conducted by international organizations, governments, NGOs and so on, it tends to lack coherent perspectives. As a result, the contents of peace-building remain ambiguous. The essay does not attempt to provide a philosophical definition of peace-building; instead, it seeks to identify a logic according to which practitioners as well as researchers can coordinate and comprehend various peace-building activities in a "strategic" manner. The essay first looks at the development of discussions on the concept of peace-building in the past 10 years, primarily focusing on documents of the United Nations. In so doing, it identifies the background of recent modifications of the concept. Then it seeks to clarify some "strategic" ways of understanding peace-building. As this essay is part of the author's ongoing project on "the rule of law approach of peace-building," it finally indicates a conceptual road map leading refinement of the concept of peace-building to broader issues of international peace operations.