[Purpose/Significance]Although Japan has not yet promulgated the relevant special laws to the Cloud industry for systematic protection,the Japanese government is trying to use cloud data and cloud computing to achieve its i-Japan strategy and improve adminis-trative efficiency. Japan's investment in the construction of Japan's Cloud industry and the security of the Cloud has greatly promoted the growth of Japan's economy, and study on it has something of referential significance for the development of China's Cloud industry. [Method/process]This paper takes Japan's large-scale Cloud Data Center and cloud security supervision policy as the objects of this study and puts emphasis on the analyses of the Industry-Academia-Government collaboration model and E-government Cloud policy such as Kasumigaseki Cloud and Self-Governing Cloud,and then summarizes the basic characteristics of Japan's cloud security and its regulatory protection mechanism.[Result/Conclusion]Based on China's own situation, China can learn from Japan's Industry-Academia-Govern-ment Collaboration model and E-government Cloud policy, and vigorously invest in its own construction of Cloud industry;the relevant laws and policies under the guidance of international standards should be made. The ultimate purpose is to realize mutual sharing of admin-istrative systems in the Cloud and improve the integration of governmental information system,and this helps to enhance the level of cloud security——from Cloud Security to Secure Cloud.%[目的/意义]日本目前虽未出台相关的专门法律对"云"产业作系统性保护,但日本政府通过利用云数据、云计算来实现"i-Japan战略"的措施,整体上提高了该国的行政效率.日本大力投资建设日本的"云"产业和保障云安全,大大促进了日本经济的增长,对其展开研究对于我国云产业的发展具有借鉴意义.[方法/过程]以日本建设的大规模"云"数据中心和云安全监管政策为考察对象,对其"产学官"三位一体的合作体制以及"霞关云"和"自治体云"等"电子政务云"政策进行分析,从而得出日本云安全及其监管保护机制的基本特征.[结果/结论]我国可以结合自身国情,学习和借鉴日本的"产学官三位一体"模式和"电子政务云"政策,大力投资建设本国的"云"产业,并出台国际标准指导下的相关法律政策,最终逐步实现行政系统在"云"上的集约共享,提高政府信息系统的整合·集约化效果,增强云安全的级别——从云安全到可信云.
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