Abstract: Since the United Nations is a non-contracting party of the Geneva Convention, it’s quite controversy that whether or not the Law of Armed Conflict is applicable to the United Nations Peacekeeping Operations (UNPKO).Beginning from differentiating and comparing the Law of War, the law of Armed Conflict and the International Humanitarian Law, the article argues that the UN is a subject of international law and qualified to sign international conventions| the UN has the qualification to join in the Hague Law System and the Geneva Law System| the UNPKO forces are engagement parties in armed conflicts and applicable to the Geneva Conventions. The article concludes that the Law of Armed Conflict is applicable to the UNPKO. The article also suggests that as a major UNPKO participant and contributor, China should support the application of the Law of Armed Conflict to the UNPKO.

Key words: United Nations Peacekeeping Operation, Law of War, Law of Armed Conflict, International Humanitarian Law, China