A rapid method of ultra performance liquid chromatography-tandem mass spectrometry（UPLC-MS/MS）was developed for the simultaneous determination of 12 carbamate pesticide residues in camellia oil based on solid phase extraction with multi walled carbon nanotubes（MWCNTs）as adsorbent.The samples were ultrasonically extracted with acetonitrile

then cleaned up with a MWCNTs SPE column.After elution with acetonitrile and concentration

the extracts were adjusted to the volume with a mixture of 01%acetic acid-acetonitrile（5∶5

by volume）.The target compounds were determined by UPLC-MS/MS in multiple reaction monitoring（MRM）mode

and quantified by external standard method.Effects of extraction methods

types of sorbents and dosages of elution solvents on the extraction efficiency were investigated.Under the optimal conditions

the MWCNTs solid phase extraction cartridge has an ideal purification effect on 12 carbamate pesticides in camellia oil

which could effectively eliminate the matrix effect.There were good linear relationships for 12 carbamate pesticides in the range of 0.005-0.1 μg/mL with their correlation coefficients（r） not less than 0.998 88.Average recoveries for 12 targets at spiked levels of 0.01

0.025 and 0.05 mg/kg ranged from 78.3%to 116%with relative standard deviations of 2.6%-12%.The limits of quantitation（LOQ）of the method were in the range of 0.2-3.0 μg/kg.