“高边疆”思想仍然是指导美国21世纪太空战略的理论基础。该理论认为，太空是人类的新边疆，美国要维持其世界领导地位，就必须保持其太空优势。随着美国太空能力的发展，美国的军事行动、政府运作、工商贸易、社会生活都越来越依赖其太空资产。这使美国太空资产的两面性，即重要性和脆弱性越来越突出。奥巴马政府2010年6月发布的美国《国家太空政策》虽然改变了小布什政府以单边主义为特色的太空战略，更多强调与其他国家在太空的合作，但维持美国在太空的领导地位和在太空科技发展中的优势的宗旨未变。
Thought of High Frontiers is still the foundation of theory of U.S. strategy of outer space in the 21st Century. The thought holds that the outer space is the New Frontier of the human beings，and if the United States wants to maintain its leadership in the world，it must keep its superiority in the outer space. With the development of the capability of the outer space of the United States，the military operation，governmental activities，business and trade，social lives of the U.S. have been more and more depending on its properties in the outer space. That has lead to the results that the dual character of both importance and fragility of the properties of the U.S. in the outer space has been more sticking out. The “National Space Policy of the United States of America” issued by Obama Administration in June 2010 has changed the outer space strategy of Bush Administration with the characteristics of unilateralism，and has stressed the international cooperation in the outer space with other countries. However，its major purpose is still to maintain the leadership of the U.S. in the outer space and the superiority of the development of technology of the outer space of the U.S.
