Abstract: Main contents of revision of Chemical Industry Standard of Industrial Ammonium Polyphosphate (HG/T 2770—2008),which involved revising purpose,significancy,product classification,increased items,parameter amendment,test method modification as well as product logos and tags etc.,were introduced.In particular,indexes and test method of high polymerization degree product were added in this revision.Test method and principle of average polymerization degree by end grouptitration and nuclear magnetic resonance (NMR) as well as the comparison of determination of nitrogen content by the two mehtods and test data were introduced in detail.At last,existing problems of the new standard were sumarrized.