Abstract: This research studies the storage stability and degradation trends of imidacloprid residues in different matrix of Lycium barbarum,by the method of directly adding 0.1 mg/kg imidacloprid,frozen storage and phase detection. The results showed that under the condition of frozen,the storage stability of imidacloprid residues is good in half a year with dry fruits,and in a year with fresh fruit of Lycium barbarum. The change of imidacloprid residue is small difference between different processing of dry fruit and fresh fruit,and it’s no significant effect on the degradation trends of imidacloprid for sample processing（crushing or homogenate）. According to testing need to storage sample which processed into crushing samples or homogenate samples as soon as possible after the sample collection,and control of dry fruit detection within half a year, fresh fruit detection within a year.

Key words: Lycium barbarum, imidacloprid, pesticide residues, storage stability