The information security system is a legal regime that ensures the safety of nations,organizations and personal data, and regulates the information security behavior of various social subjects. With the arrival of big data era, information crime incidents such as network hackers, information thefts and privacy violations threaten not only security of network environment, but also national sovereignty of cyber space. Governments have raised “moderate security” principle to “big security” principle of national information security and network security strategy, and have promulgated a series of policies, laws and regulations to maintain information security environment and improve information security capability. According to relevant legislations and researches of each country, this paper analyzes evolutionary path of information security system from three levels of information security concepts, legislative principles and construction of legal system.

By using the methods of literature analysis, comparative analysis and comprehensive analysis, the evolution of the concept has experienced three stages: information confidentiality, computer security and information security. The principle has evolved from “moderate security” to “big security”. The national information security legal system path has evolved along the communications and computer security legislation, network security legislation and information security system legislation. The legislative framework, legislative scope and legislative content of each stage are different. This paper provides a reference for the whole framework of building a new information security system through a multi angle and three dimensional analysis.

Information security is a positive defense measure of content security, data security, physical security, network security and information infrastructure security under the big security concept. Information security system is moving from dispersion to unity, from simple legislation to “Legislation and Implementation Mechanism”. The security system is the formation of a technology, management, legal system, culture and other elements, transnational and cross regional, all round active defense overall linkage framework. Above it, some international consensuses have been reached, including information security from passive defense to active defense, information security legislation by the decentralized single line legislation to a unified legislative transformation, information security efforts to upgrade,the construction of international coverage of information security system become a trend, national information security strategy and its action plan in full swing.Under the guidance of the principle of overall national security, China's national information security guarantee system based on the “National Security Law” is also on the road to soundness and development.

In the future, the main research contents in this field should include the new information security initiative defense technology, the overall linkage framework of the new information security system, the all round construction of the new information security cultural security system and management system, the international information security sharing and risk prevention,and other new contents about the construction of information security system as well. 2 figs. 5 tabs. 105 refs.