XML(eXtensible Markup Language)is a standard which was issued by W3C(wolld wide web consortium) in February,1998.It defines the data structure by means of an open self-description.Also a group of rules of XML can be used to set up Markup Language in accordance with specific applied fields.Furthermore,based on XML,cnXML is a linguistic norm of electronic business affairs,which is keeping with the commercial habits,tradition and circuit in the continent of China.cnXML supplies a set of unified,flexible,open and extensible exchange pattern of data,which makes all trade partners including such commercial organizations as buyers,sellers,runners and intermediary etc.carry out commercial activities conveniently through Internet.So cnXML is not only a standardized norm but also a premise of electronic business development in China.