Since 2011, the global arms race of cyber is intensifying. In order to realize the cyber deter- rence and seek the strategic advantage, USA has issued some programmatic documents to promote the development of cyber security, including National Strategy for Trusted Identities in Cyberspace, International Strategy for Cyberspace, and Action Strategy for Cyberspace. From the Clinton admin- istration to the Bush Administration, and to the Obama administration, USA is gradually developing cyber security--related aspects of organization control, network technology and military capabilities, aiming at taking further control over the power of setting the security standards and rules of interna- tional Internet in a new round of "network warfare". This article analyzes the evolution process and characteristics of American cyberspace security strategy and provides some enlightenment for our country.%2011年以来，全球性网络军备竞赛愈演愈烈，为实施网络威慑，谋求战略优势，美国相继发布了《网络空间可信标识国家战略》、《网络空间国际战略》、《网络空间行动战略》等推动网络安全发展的纲领性文件。从克林顿政府到小布什政府，再到奥巴马政府，美国逐步推动与网络安全有关的组织管理、网络技术和军事能力等方面的发展，旨在在新一轮“网络战”中，进一步掌控制定国际互联网安全标准和规则的主导权。本文通过对美国网络安全战略的分析，剖析其脉络和特点，希望对我国网络安全建设有所启示。
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