In this paper,a method was established for the determination of the residues of nitenpyram in Lycium barbarum.The samples were extracted with methanol,purified by PSA and C18,detected by ultra performance liquid chromatography-mass spectrometry(HPLC),and quantified by external standard method.The results showed that there was a good linear relationship in the range of 0.01～1.00 mg·L-1,and the correlation coefficient was greater than 0.999.The average recoveries were 73.1％～86.1％and the relative standard deviations were 2.6％～6.7％at three supplemental levels(0.01,0.10 and 1.00 mg·kg-1).The limit of quantitation was 0.01 mg·kg-1.At-18 ℃ and storage time of 11 months,the degradation rate of nitenpyram in Lycium barbarum was less than 30％.This method has high accuracy and precision,which is a practical analysis method.
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