A method was developed for the rapid screening and analysis of 32 banned and restricted components in hair dyes by ultra performance liquid chromatography-quadrupole/electrostatic field obitrap high resolution mass spectrometry.The samples were extracted using a mixed solution of methanol and 2 g/L aqueous ascorbic acid

and purified with n hexane.The separation was carried out on an ZORBAX Eclipse Plus C18 column（3.0 mm×100 mm，1.8 μm）by gradient elution with methanol and 5 mmol/L ammonium acetate as mobile phases.The 32 components were simultaneously analyzed in switching positive and negative modes.The retention time

accurate mass of parent ion and relative isotope abundance in full scan mode were used for fast screening of multi components in hair dyes

while accurate mass of fragment ions in two stage threshold triggered full mass scan mode were used for confirmation.Under the optimal conditions

good linearities（r2>0.99）were obtained in their respective concentration ranges.The limits of quantitation（LOQ）for 32 compounds were in the range of 0.2-40 μg/g.The recoveries ranged from 81.0% to 110% with relative standard deviations（RSDs）of 3.3%-9.9%.The method was simple

sensitive and accurate

and was suitable for the rapid screening and confirmation of 32 kinds of banned and restricted component in hair dyes.