A new ［BMIM］PF6-GR-CHIT/GCE modified electrode was fabricated via the film formed by chitosan（CHIT）,and using graphene（GR）and ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate（［BMIM］PF6） as modifiers.In 0.1 mol/L PBS solution,the electrochemical behavior of p-aminophenol（PAP） at ［BMIM］PF6-GR-CHIT/GCE was investigated by cyclic voltammetry and differential pulse voltammetric method.The cyclic voltammetric curve of PAP at the ［BMIM］PF6-GR-CHIT/GCE electrode presented a pair of sensitive and reversible redox peaks.The peak current response at the proposed electrode was enhanced 2.2 folds as high as that at the GR-CHIT/GCE,and the peak potential difference was 0.045 V.The differential pulse voltammetric peak current of PAP at ［BMIM］PF6-GR-CHIT/GCE showed a good linear relationship in the concentration range of 5.0×10-6-5.0×10-4 mol/L,with a detection limit（S/N=3） of 3.0×10-7 mol/L.The method was used in the determination of p-aminophenol in water sample with satisfactory result．