Abstract: Polylactic acid fiber fabrics were treated respectively with five flame retardants—HBCD、TBB、TBP-A、TBP-A-2EO、TPP.The absorptivity of TPP and TBP-A were very high.However,the limiting oxygen index(LOI) value of the treated fiber remained at 25.9% when the absorptivity of TBP-A increased over 4.38%.LOI value reached 27.8% when the absorptivity of TPP was only 3.05%.When the amount of absorbed TPP increased to 12.8%,however,the LOI value decreased to 25.4%.The scanning electron micrograph and DSC data show that an excessive amount of TPP crystallization was on the surfaces of polylactide fibers and the tensile strength was cut down by 70%.These results indicate that moderate TPP treatment can impart polylactide fibers high flame retardant property.