這去看聯合國憲章就很清楚了
英文版
http://www.un.org/en/documents/charter/chapter5.shtml
中文版
http://www.un.org/zh/documents/charter/chapter5.shtml
The Security Council shall consist of fifteen Members of the United Nations.
The Republic of China, France, the Union of Soviet Socialist Republics, the
United Kingdom of Great Britain and Northern Ireland, and the United States
of America shall be permanent members of the Security Council.
安全理事會以聯合國十五會員國組織之。中華民國、法蘭西、蘇維埃社會主義共和國聯
盟、大不列顛及北愛爾蘭聯合王國及美利堅合眾國應為安全理事會常任理事國。