Positively charged chitosan (CS) and negatively montmorillonite (MMT) were layer-by-layer (LBL) assembled on Xuan paper pulp fiber to fabricate an organic/inorganic flame-retardant coating. The achieved a limiting oxygen index (LOI) value of 24.6% when the was treated by 20 bilayers (BLs) CS/MMT coating, its vertical flame properties also improved with less after-flame after-glow times compared...