A new high performance liquid chromatographic（HPLC） method with ultraviolet detection was firstly developed for the determination of 2 （3 tert butyl 2 hydroxy 5 methylphenyl） 5 chloro 2h benzotriazole（UV 326） and 2 （2 hydroxy 3,5 di tert butylphenyl） 5 chlorobenzotriazole（UV 327） in composite laminated food packaging bags.The samples were extracted by ultrasound assisted extraction method.Then，the extracts were further concentrated by rotary evaporation technology and cleaned up with solid phase extraction column.The eluent was evaporated to near dryness under a stream of nitrogen and redissolved with methanol.The separation of target compounds was performed with Agilent ZORBZX SB C18 column（250 mm×4.6 mm,5 μm） using methanol as elution reagent at a flow rate of 1.0 mL/min at 30 ℃.The quantitative analysis of target compounds was performed by the external standard method at a detection wavelength of 310 nm.The result indicated that the calibration curves were linear in the range of 0.2-10 mg/kg for UV 326 and UV 327 with both limits of quantitation of 0.2 mg/kg.The average recoveries of UV 326 and UV 327 were in the range of 75%-90% and 80%-85%,respectively，with RSDs of 3.6%-6.7% and 3.4%-4.2%,respectively.The method could be applied in the determination of UV 326 and UV 327 in composite laminated food packaging bags.