Abstract:Abstract：The components and structures of the jerked yak meat sample are very complicated.The traditional chemical method or gas chromatography often produce false positive results for the detection of trichlorfon residues for these kinds of samples，while the liquid chromatography-tandem mass spectrometry method needs sophisticated equipments.So a new method for the determination of trichlorfon residues based on gas chromatography-mass spectrometry was established.The pretreatment of yak jerky meat，the inlet temperature of the instrument 260℃，HP-5MS capillary column，pulse non-splitting injection and other optimum conditions were determined.Through some experiments，a new method of gas chromatographic-mass spectrometric （GC-MS）coupled with liquid-liquid extraction was worked out to determine the trichlorfon residues in jerky meat.The recovery rate of this method was 85.3%-102.3%，RSD＜5.1%，linear correlation coefficient was 0.999 9，detection limit was 0.02 mg/kg.