Taking the standard system of rare earth in China for an example and based on the present standard system of rare earth, standard updating information is analyzed and estimated through searching the standard database CSSN to solve the problem about standard updating quantification. It is thought that the ways of standard updating are divided into two kinds: one to one and more to one. At the same time， the numerical value model about standard updating is developed for distinguishing and calculating the updating ways of nation standard system and industry standard system of rare earth. The updating ways of rare earth standards and their annual standard-updating are quantified, which can reflect the technology advancement and development of rare earth industry on some extent. At last, the standard-updating model is also used for alike standard systems of other industries.