本文通过使用AC10毛细管柱进行实验研究，探讨了设置GC色谱分离条件：柱温、载气流速（柱流量）、检测器温度、汽化室温度、汽化室分流出口吹扫流量及吹扫时间、检测器的燃气与助燃气流量、尾吹气流量对峰高、峰面积、保留时间的影响，找到了最佳的色谱条件，该色谱条件检测马拉硫磷的最小检出浓度为0.005 mg/kg，测定保留时间的相对标准偏差为0.27%，峰面积的相对标准偏差为0.38%，结果显示该色谱条件的灵敏度、精密度良好，证明了我们选择的最佳色谱条件完全满足粮食卫生标准规定的原粮中马拉硫磷残留限量标准的检测要求．

Using AC10 capillary column for GC analysis of malathion content in Cereal, the influence of peak height, peak area and retention time, oven temperature, carrier gas flow rate (column flow), detector temperature, injector temperature, purge flow and time for split vent, H2 flow and Air flow, make-up flow rate, were discussed and optimized. The detection limit of the method was 0.005 mg/kg and the recoveries of malathion and coefficient variation ranged from 78.54% to 92.03% and from 1.52% to 5.32%, respectively. Results showed that the sensitivity, accuracy and precision of the method were suitable for the residue analysis of pesticide. It also proved that the detection limit of the method with the optimized chromatographic parameters were in accordance with the requirement for testing MRL of malathion according to the hygienic standard for grains completely.