本文採用David Easton和K.J.Holsti的「政治體系」理論，來探討後冷戰時期菲律賓之外交政策。 羅慕斯總統因美濟礁事件，第一步推動更新及擴展軍備；第二步是試圖建立南海制度；第三步是引進英、美勢力來達成區域「權力平衡」，幫助馬尼拉重建對中國霸權的威懾力量。 艾斯特拉達政府時期，菲國協調柬埔寨政變，提出該「建設性干涉」緬甸以及眾議院建議停止其會員資格，支持將「不干涉原則」修改為「彈性介入」，因安華事件與馬國產生外交齟齬，更參與東帝汶危機進行人道救援任務。 艾洛雅總統以支持美國反恐為外交政策主軸，分別從國內、區域、全球三個層面下手，不但復甦了菲美雙邊關係、提高菲國的區域與國際能見度、更得到美國協助掃蕩「阿布薩耶夫」恐怖組織。 This research adopts David Easton and K.J.Holsti’s “Political System” to analyze the Philippine foreign policy in the post cold war period. The Mischief Reef incident spurs President Ramos. His first diplomatic approach is to push for the modernization of the armed forces； The second is resort to develop “institutionalism” in the South China Sea； The third is to rely on the U.K. and U.S. in a balance of power, the development of mechanism of deterrence between China and the Philippines. During Estrada era, Philippines coordinate the coup in Cambodia, and propose an approach “constructive intervention” to Myanmar, and the House of Representatives call for the suspension of Myanmar from the ASEAN. President Estrada also proposes to modify the ASEAN Way of diplomacy from “non-interference” to “flexible engagement”, and he openly criticizes the issue that Mahathir arrest Anwar. The Philippines is sympathetic to some form of humanitarian intervention to East Timor issue. President Arroyo looks at the domestic, regional, and international levels that continue to shape the Philippine foreign policy of supporting the United State’s war against international terrorism. Not only it has reinvigorated Philippine-American relations, and enhances its visibility in the international society, but also gains American military assistance against Abu Sayyaf Group.