A new method of extracting perfluorooctanoic acid from the textile and textile finishing agent by ultrasonic synergistic-microwave extraction is described for the first time.The optimal condition is determined according to an orthogonal design,and the target substance is detected by gas chromatography-mass spectrometer(GC-MS).The linearity is excellent in the range of 0-50 μg/mL,R2=0.999 9.The detection limit of PFOA is 12.6 μg/L,the recoveries are in the range of 80%-100%.The optimal condition is:microwave...