在国家标准版国际贸易单一窗口在各地全面推广的背景下，海南省结合国家对中国（海南）自由贸易试验区的发展定位，在地方层面进行了单一窗口特色应用功能方面的初步探索。海南国际贸易单一窗口建设先后经历了电子口岸的开通运行（2006～2014年）、关检合作“三个一”的全面推进（2014～2017年）、海南国际贸易单一窗口的正式启动（2018年9月至今）等三个发展阶段。经过实践探索，海南国际贸易单一窗口建设已基本形成国家标准版应用功能（国家层面）和海南特色应用功能（地方层面）二者相结合的功能框架。本报告同时还介绍了大国模式（以美国为例）和小国模式（以新加坡为例）下全球高标准国际贸易单一窗口建设的成功经验。美国的经验在于，通过制度化的贸易流程再造和边境跨部门机构间合作的实施和落实，为美国国际贸易单一窗口的功能实现奠定基础。同时，美国在单一窗口建设中形成了监管层和功能层两大模块，前者负责监管和执法安全下的贸易便利化，后者通过引进第三方服务商保证贸易合规性和提升贸易效率。新加坡的经验主要包括三点：第一，通过科学的贸易监管制度设计为国际贸易单一窗口的监管安全提供保障；第二，以ICT技术手段为基础，结合企业需求，提供多样化的综合功能服务；第三，通过制定和完善法律，为国际贸易单一窗口的功能创新保驾护航。
When the most places of China is comprehensively advancing its national standard “international trade single window”，Hainan has joined the country’s development positioning on the Hainan Pilot Free Trade Zone to preliminarily explore the characteristic uses of a single window at the local level. Hainan’s construction of an international trade single window has undergone three phases of development，namely the launch of an electronic port （2006-2014），the comprehensive promotion of the “three ones” for customs-inspection & quarantine agency cooperation （2014-2017），and the official launch of the International Trade Single Window （from September，2018 to the present）. After practical exploration，a functional framework combining national standard applications （at the national level） and Hainan characteristic applications （at the local level） has been formulated in Hainan’s International Trade Single Window. This report also introduces the successful construction of an international trade single window with global standards in both a major power （the U.S.） and a small country （Singapore）. The U.S. experience is that through institutionalized trade process reconstruction and the implementation of inter-agency cooperation along its border，it has laid a foundation for creating an international trade single window in the U.S. and has formed a regulatory layer and a functional layer during its construction，among which the former was responsible for trade facilitation under regulatory and trade security while the latter guaranteed trade compliance and efficiency with the help of third-party service providers. Singapore’s experience lies in three aspects. First，it provides guarantee for regulatory security of its international trade single window through scientific mechanism design of the trade supervision system；second，it provides a diverse and comprehensive functional service based on ICT technology and needs of enterprises；and third，through the formulation and improvement of legislation，it escorts the functional innovation for the international trade single window.
