Abstract:In this article, starting from popularizing scientific knowledge, the characteristic elements of the concept of time are introduced emphatically. Comprehensive exposition of National Standard Time is given in terms of its generation and determination. In the light of international situation, based on the correct understanding of the relevant concepts, definitions, conventions and their relationship, some correlatived concepts invoving national management regulations,technical system,science education and security strategy are discriminated. At the same time, analyzing and correcting the misunderstanding of the current language concept, overall development ideas are put forward.