Recent research progress in preparation and characterization of type II long-chain (polymerization degree≥ 1 000) ammonium polyphosphate( APP) was reviewed. A suitable calculation formula of APP polymerization degree for nuclear magnetic resonance method was given.It was pointed out that phosphoric-anhydride polymerization method replaced by non-anhydride polymerization method and crystal-type transition method, which have safe technical processes will be a development trend.The development and application of new type reactors,and the join uses of different characterization methods will become the focus of research.%综述了Ⅱ型长链聚磷酸铵(聚合度≥1 000)制备与表征的近期研究进展,给出了核磁共振法适用的聚磷酸铵聚合度计算公式.指出工艺安全的无酐聚合法、晶型转化法取代磷酐聚合法将是发展的趋势；新型反应器的开发与应用以及不同表征方法的联用将成为研究的重点.
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