在美國歷史上所簽訂的 14 項 FTA 中，NAFTA 與 CAFTA-DR 最能展現總統與國會在 FTA 政策制訂上所扮演角色與影響決策的程度，故本文以此兩項 FTA 作為研究美國 FTA 決策主體的案例。研究發現，在對外政策的決策主體的三種不同的模式:總統主導模式、國會主導模式與互動模式中，總統模式最能解釋美國 FTA 政策。總統具有龐大的國內外行政資源與政黨力量，可以干預國會的決策並改變個別議員的投票傾向，在不影響 FTA 基本內涵與目的下促使國會通過..

Among all 14 FTA’s signed by the U.S. in history, NAFTA and CAFTA-DR - selected by this paper as cases to identify the entity that owns the power of dominating the U.S. FTA policy - most represent the dynamics and impacts of President and Congress on the FTA policy formation. The research shows that among the three models of decision-making entities of foreign policy - President, Congress, and Interaction, the President model best explains the decision-making of FTA policies. President controls enormous external and int..