Abstract:Procymidone in frozen leek sample was extracted by ethyl acetate，purified by silica gel column and then analyzed by gas chromatography-mass spectrometry（GC/MS）using external standard method.The results showed that，procymidone in frozen leek performed good linear from 0.05 μg/mL to 0.7 μg/mL，with relative coefficient of 0.999 9.The recoveries ranged from 95.4%to 98.5%with relative standard deviations of 1.22%-3.08%in adding level of 0.006，0.01 and 0.2 mg/kg.The limit of detection was 0.002 mg/kg and the limit of quantification was 0.006 mg/kg.Comparing with common methods such as the QuEChERS （quick，easy，cheap，effective，rugged，safe）method，it was safer，easier operation，more convenient quantification without matrix matching standard curve，exhibiting practical application value.