采用气相色谱法测定荔枝中联苯菊酯、甲氰菊酯、氯氟氰菊酯、氟氯氰菊酯、氯氰菊酯、氰戊菊酯和溴氰菊酯等7种拟除虫菊酯类农药的残留量。荔枝样品用丙酮-正己烷（1+1）混合液提取，所得提取液用活性炭柱和中性氧化铝柱的串联柱净化，用DB-35毛细管色谱柱分离，电子捕获检测器检测。7种拟除虫菊酯类农药的质量浓度均在0.05~0.8 mg·L^-1内与其峰面积呈线性关系，方法的检出限（3S/N）在0.005~0.01 mg·kg^-1之间。在0.05，0.1，0.2 mg·kg^-1等3个浓度水平进行加标回收试验和精密度试验，回收率在81.0%~104%之间，测定值的相对标准偏差（n=6）在1.7%~5.1%之间。采用此法测定了荔枝样品中联苯菊酯的含量，所得测定值与行业标准方法测定结果相符。

GC was applied to the determination of residual amounts of 7 pyrethroid pesticides, i.e. bifenthrin, fenpropathrin, cyhalothrin, cyfluthrin, cypermethrin, fenvalerate and deltamethrin in litchi. The litchi sample was extracted with a mixture of acetone-n-hexane (1+1), and the extract was purified with activated carbon column and neutral alumina column in series. The analytes were separated on DB-35 capillary column and detected by ECD. Linear relationships between values of peak area and mass concentration of the 7 pesticides were kept in the same range of 0.05-0.8 mg·L^-1, with detection limits (3S/N) in the range of 0.005-0.01 mg·kg^-1. Tests for recovery and precision were made by standard addition method at 3 concentration levels of 0.05, 0.1, 0.2 mg·kg^-1, giving values of recovery and RSD's (n=6) in the ranges of 81.0%-104% and 1.7%-5.1% respectively. The proposed method was used to determine bifenthrin in litchi samples, giving results in consistency with values given by the professional standard method.