The phosphazene-based compounds are halogen-free and environmentally-friendly. Some of them are biocompatible and can be used as flame resistant materials. However,these compounds often lack water-soluble. Some reports attempted to produce a fire-retardant product by using melt blending or padding processes to combine the polymer with the textile. They can't be directly applied in natural fibers and are not desirable for some uses. In this paper,we synthesized the water / ethanol-soluble,nonhalogenated cycl...