Development and application of Mechanical Drawings National Standard

Based on the development history of the National Standard of Mechanical Drawings,this paper mainly expounds the meaning of revision of the National Standard,explains the basic common sense of standards in detailed,and provides the substitution schedual of the new standard for the old one in mechanical drawing.In addition,some problems in implement and application of the standard are proposed.This paper aims at improving the standardization consciousness,and enhancing the study of new standard,and offering certain help in understanding and implementing the new standard without deviation.