As the nature of global disputes is gradually complicating, the United Nations' is conducting Peace Keeping Operation(PKO) to solve and control disputes with complicated backgrounds, and some scholars advocate that PKO is one of the growing industries of the international community today. This is particularly so amid the expectation that causes of disputes will be further diversified due to issues related to environment and resources, acceleration of the market economy, as well as the weakening role of Russia as a super power, and the possibility of worsening disputes in Africa. The potential spread of large scale disputes is gradually decreasing while the possibility of accidental outbreak of fighting with weapons causing massive casualties still prevails in the world today. Accordingly, the strengthened function and the increased role of the United Nations is further being urged. Since the introduction of the new world order, 28 PKO organizations have been established over a ten year period, which can be said an enormous increase. Currently, 16 PKO organizations are conducting their missions with more than 26,000 men from over 70 countries worldwide are participating in PKO. Despite the participation of so many countries and men, their success will solely depend on the determination and active participation of UN members. Many disputes occurring in the various regions cannot always be solved by PKO. However, the participation in PKO by so many countries, under such uncertainties, is done not to support any certain group or powers by taking sides with them, but from an aspiration by people and nations to live in a peaceful and safe world.