Gas chromatography(GC-ECD) and gas chromatography-mass(GC-MS) methods were developed for the detection of bifenthrin residue.Extracted by 4:1 n-hexane:acetone mixed solution,purified by GCB/NH2 SPE column or the combination of LC-Florisil SPE column and Carb SPE column,concentrated by nitrogen-blow and detected by GC-ECD and GC-MS,there was a good linearity within the range of 0.02-0.2 mg/L with the correlation coefficient of 0.999.The recoveries were between 85.0-119.0% with the relative standard derivatio...