Abstract: The establishment of "safety science and technology" as the first grade discipline in the national standard classification and code of disciplines,which took five years,Was introduced,the implementation and practice situation of this standard in the sixteen years after its being promulgated was briefed.On the basis of the discussions and argumentations of multi-parties in recent three years,an amendment about the system of "safety science and technology" as the first grade discipline Was made again in May 2009.This amendment made clearer the titles,arrangement and affiliation of the sub-disciplines of "safety science and technology",and added several second-grade and third-grade disciplines,which makes the discipline contents of"safety science and technology"broader,more systematic and complete.The promulgation and implementation of the new national standard classification and code of disciplines (namely,GB/T13745-2009 instead of GB/T13745-1992)would make the status of "safety science and technology" as the first grade discipline more consolidating,developing and perfecting in Chinag science and edueational sector.