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The POSS and ammonium polyphosphate is used together as flame retardants,and their best proportion is optimized through the orthogonal experiment.The flame retardant and waterborne polyurethane composite as environmentally friendly flame retardant coating agent and flame retardant coating finishing are carried out on cotton fabric,and flame retardants and the ratio of waterborne polyurethane are discussed as well as the amount of coating on the properties of fabric flame retardant performance and other effects.Results showed that the cotton fabric treated by synergistic flame retardant waterborne polyurethane highlights the good flame retardant performance has with better apparent activation energy than that of untreated cotton fabrics,.