A flame retardant containing phosphorus and nitrogen was synthesized using phytic acid dicyandiamide, it subsequently used to prepare flame-retardant cellulosic paper via an impregnation method. Vertical limiting oxygen index (LOI) were evaluate the retardancy of paper. The modified characterized with Fourier transform infrared spectroscopy (FTIR), thermogravimetry (TG), X-ray diffraction (XRD)...