After the Government of Republic China retreated to Taiwan in 1949, the issue of which regime - Taipei or Beijing - should represent the legitimate Chinese government constantly perplexed the United Nations for more than two decades. In this long-drawn debate, the U.S. government continuously made strenuous efforts to maintain the seat of the Republic of China at the United Nations. This article utilizes the declassified documents of the U.S. State Department in discussing how the White House once considered adopting the "two Chinas" formula as a solution to the "Chinese Representation" predicament at the United Nations, as American decision- making officials held a pessimistic view of the vote on "Chi-Rep issue" in 1966. But with Taipei strongly resisted such formula, and the eruption of the Culture Revolution in China, Washington eventually chose not to carry out the "two Chinas" policy.