This paper systematically discusses some fundamental implications of resources secu-rity and gives a preliminary classification of national resources security.The authors consider that the resources security is the mutual balance of resource supply and demand,thus it is a multiple concept with rich implications.In terms of geographical space,the resources security can be divided into global,regional and local ones.In the context of time se quence,the short-,middle-and long-term resource securities may be classified.Based on the types of economies,the national resources-producing security and national resources-consuming security may be dis-tinguished.The resources security was resulted from resources shortage or scarcity and oil secu-rity was the first presentation in the resources worries of historical develop ment in the world.The paper further analyzes the implications,basic characteristics,factors and development trends of national resources security and discusses the different kinds of strategies for national resources securities.Finally,from the perspective of system theory,seven major strategies guaranteeing na-tional resources security are identified,namely,resource conservation strategy,resource circula-tion strategy,resource consumption strategy,resource utilization strategy,resource recycle strate-gy,resource innovation strategy and resource management strategy,by which the multiple guar-anteeing system of national resources security may be established.