The QuEChERS method for rapid detection of 12 pesticide residues in leek was established
in combination with LC/GC-MS-MS，taking acetonitrile as solvent for ultrasonic extraction and PSA and C₁₈
as adsorbent for solid extraction. The involved 12 pesticides were imidacloprid，dichlorvos，chlorpyrifos，
carbendazim，procymidone，methamidophos，fenpropathrin，carbofuran，benzex，chlordan，cyhalothrin and
abamectin. Then the pesticide residues status in leek of Shanxi Province was dynamically monitored and analyzed.
The results showed that the total detection rate of pesticide residues in leek was 80%，and the over standard rate
was 20%. Frequently used pesticides were imidacloprid，dichlorvos，carbendazim，procymidone，fenpropathrin
and cyhalothrin. For the unqualified samples，the higher residues of procymidone was the main reason. The level
of pesticide residues of Taiyuan City and its surrounding areas was higher since August. Meanwhile，the detection
rate of pesticide residues in leek from the nearby farmers markets was close to that from supermarkets. However，
the over standard rate of the former（27.3%）was evidently higher than that of the latter（9.1%）.