Peace-building as one of the concepts of peace operations in general, recently is becoming more frequently analysed phenomena in political science and objectives and goals of peace-building more often becomes part of agenda and actions of international and nongovernmental organizations. Today peace-building became an integral part of missions conducted by United Nations (UN) and European Union (EU). These tendencies are evident in NATO too and the largest regional organization - Organization for Security and Co-operation in Europe (OSCE) - is active in early warning, conflict prevention, crisis management, post-conflict building. The purpose of the article is to analyse concept of peace-building and its measures, mechanisms used in peace operations. The first part of the article analyses how concept peace-building is analysed in UN, EU, OSCE and NATO by having an aim to show the language used by these organizations and what's the content of the terminology. The second part analyses peace-building operations in Bosnia and Herzegovina (BiH), primary focusing on peace-building mechanisms used by UN, NATO, OSCE and EU. An example of BiH was chosen because of the state's importance both to the European Union and security in Europe as a whole and of special design of political system of the state after Dayton Agreement.