海洋是國家發展的利基，亦是我們賴以生存最重要的憑藉，更是捍衛國家安全的第一道防線。臺灣地處西太平洋第一島鏈中央地帶，戰略地位極為重要，從臺灣的地理特性和地緣位置來看，臺灣的國家安全與海洋是密切相關的，海洋不僅是國家安全的重要緩衝空間，也是維護國家安全的屏障和門戶，控制了海洋即可加大安全縱深，遏止來自於海洋方面的威脅。 臺灣是一個海洋國家，海洋權益的確保、藍色國土的經略乃政府施政的重大目標。今日我們面對海域主權權利、海洋資源、海洋環境等各項層面的威脅及挑戰，需站在戰略及國安的高度展開多面向的海洋戰略(包括尋求國際合作、爭取國際地位等)，並制定國家海洋政策，有效經營海洋資源，方能增進全方位的國家利益，以落實海洋國家發展願景。 行政院海岸巡防署為中華民國開國以來第一個依法定程序設立且律屬於行政院二級部會層級的海域執法專責機關，除海軍以外，為我國第二大擁有海上執法能量的武裝團隊，肩負起維護國家安全、海上治安及救災救難等重責大任；其擁有獨立運作且強而有力的海域司法管轄權，並代表國家執行公權力、伸張海權，以維護國家海洋權益及確保國家安全。 關鍵詞：國家安全、國安戰略、海權、海洋戰略、海洋政策、海軍戰略、地緣戰略、海巡署、海軍、海關 / The sea is the gateway for national development, the most important reliance for our survival, and the first line of defense for national security. Taiwan locates in the middle of the first island chain in the west Pacific with strategic significance. From the geographical points of view, Taiwan's national security closely relates to the sea, which not only acts as important buffer zone for national security, but also safeguards barriers and portals of national security. Controlling the sea deepens the depth of security and deterring threats from the sea. Taiwan is a maritime country. To ensure maritime rights and interests, the governance of Blue Territory is a major goal to the government. Today we are faced with issues such as the sovereign rights of the sea, marine resources, marine environment and other aspects of threats and challenges. It is necessary to take strategic vantage point of national security and expand multi-faceted maritime strategies (including international cooperation and international status, etc.). In order to effectively manage marine resources for all the spectrum of the national interests, national policies and visions of the sea should be developed and fullfilled. The Coast Guard Administration of the Executive Yuan (CGA) is the first ministerial agency of the Republic of China specifically for maritime law enforcement. In addition to the Navy, the CGA has become the country's second largest armed forces responsible for national security, maritime peace and search and rescue, etc. at sea. Representing national authority and sovereignty, it operates independently and holds strongly jurisdiction in sea territories to preserve national maritime rights and interests and to ensure national security. Keywords: national security, national security strategy, sea power, maritime strategy, sea policy, naval strategy, geostrategic, Coast Guard(CGA), Navy, Customs