After the United States interfered with the South China disputes in July 2010, America’s open position was not taking sides on the competing territorial disputes over sovereignty in the South China Sea. But since 2015, the United States has more and more deviated from the position of no taking sides, and turned to be tough and deep interference. America’s policy transformation reflects the United States feels anxiety about the transformation of power structure in the South China Sea region. It serves America’s need to adjust “rebalancing towards Asia Pacific” strategy to prevent China from challenging the Asia Pacific order dominated by the United States. America’s continuous and deep interference makes the South China Sea issue be doom to be a perennial and competing strategic issue between China and the United States.%自2010年7月，美国全面介入南海争端后，对外公开表达的立场是，在领土主权归属问题上，“不选边站”“不持立场”。然而，自2015年以来，美国越来越偏离“不持立场”的态度，转向事实上的“持立场”，公开反对中国的主权主张。美国政策的转变反映了美国对南海地区力量格局转变的焦虑和不安，更是美国调整“亚太再平衡战略”，防止中国挑战美国主导的亚太秩序的需要。美国的持续深度介入使南海问题将注定成为中美之间长期博弈的战略问题。
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