The United Nations reformation, For the first time, is handled comprehensively on World Leaders Summit on 14-16 September 2005. The World Leader Summit will consider UN reform and review progress of the Millenium Development Goal's adopted by the United Nations in 2000. The World Summit established an outcome document named as “2000 World Summit Outcome”, and contains some of the important issues such as development, peace and collective security, use of force under the Charter and collective military action authorized by the Security Council, terrorism, peacebuilding commission, human rights, responsibility to protect, reformation of General Assembly, Security Council, Economic and Social Council, establishment of Human Rights Council, Secretariat and amendment of United Nations Charter.The leader failed to agree on the expansion of the Security Council membership, no agreement on the issue of non-proliferation of weapons of mass destruction and disarmament. They have failed to reach agreement on a total commitment from developed countries to achieve the target 0.7 per cent of GNP for official development assistance by 2015. However these failures is related to political reality in International community.