美國國家公園系統共含三百六十多處不同單位，分成二十個類別，全美 有超過領土的3土地，統由內政部國家公園署管轄，執行保育與遊憩兩大任務。 國家公園系統發展在歷經幾次關鍵性的變革(1916年國家公園署的誕生。1933年機 關權力重整行政命令、1980年阿拉斯加權益用地法案(Alaska National Interest Lands Conservation Act)等，得到政府與民間的優勢擁護，弭平了抗衡的勢力而趨於成熟 且擁有全方位、多米多姿的資源內涵，宛然若見自然界之歧異度與動態平衡。 美國國家公園當局在既要保存環境無損又能便當代及後代怡情悅性的兩難間拿 捏，同時以其本身民族大熔爐特性，尚得遊走於各級政府及民間利益團體間，自 然地。在資源的利用與保護間就充滿了多重折衝的現象。 幸而，鐘情大地的自然學家齊集了擁護國家公園運動的草根力量，配合美國社會 的民主法制，影響國會決策，更獲致最高權力的關鍵性支持，促成了系統的圓滿， 然而，系統整合後的擴張意味著管理壓力(內有預算箝制、遊憩壓力、環境品質 惡化;外有城區擴張、機械運輸激增)的提昇，為了排解此等壓力，近已發展由國 家公園提供經費及技術援助，協肋不同層級的政府及地方利益團體共同規劃，藉 此綠色聯盟公園規劃法(Greenline Park Approach)為國家公園系統壓力尋找適當的 出路，以合作規劃代替事權爭奪，當足資吾國未來開創國家公園系統殷鑑之處。

　　　　　The US national park system comprises more than 360 areas; divides inio 20 types, andcovers some 3 US territory. It is administered by the National Park Sendee the N.P.S.) of the Department of the Interior, and performs such missions as both conservation andrecreation. Following several important events, such as the birth of N.P.S. in 1916, an Executive Orderin 1933, and the Alasks National Interest Lands Conservation Act in 1980, the national parksystem obtained great support from the government and the people. Hence, it counterbalanced opposite forces and became more diverse and dynamic in respect of resource components as natural world. Park authority put itself in a dilemma because its purpose was not only to leave wild landsunimpaired but also to provide enjoyment to contemporary and future generations. Since therewere complex conflicts between visitor use and resource management, .it needed to be sophisticated to tackle these subtle issues when it negotiated with different government offices andinterest groups. Fortunately, naturalists who had passionate interests in wilderness assembled the grassroot force from different advocates. They affected the decision-making of Congress throughdemocratic process, and also won the critical support of the highest authority - the President.Consequently, they fostered the wholesome of the system. Nevertheless, the expansion after system-integrating implied the enhancement of stresson management. Internal factors were budgetary shortage, recreational pressure and thedeterioration of environmental quality; external ones were urban expansion, and the rapidincrease of mechanical transportation. In order to release these stress, the park authoritydeveloped a Greenline Park Approach which supplied funds and technologic assistance to localgovernment and interest groups and worked with them through comanagement instead ofjurisdictional disputes. By doing these, the system found an adequate outlet for its pressure.Comparing the history of US National Park with our situation can benefit us to integrate ourown national park system.