A novel gold nanoparticles（GNP） and ionic liquid ［BMIM］PF6 modified glassy carbon electrode（GNP-［BMIM］PF6/GCE） was prepared. GNP and ［BMIM］PF6 were characterized by IR spectra. The electrode surface electrochemical property of GNP-［BMIM］PF6 modified electrode was studied by electrochemical impedance spectroscopy（EIS） and the behavior of bisphenol A （BPA） on the modified elctrode was investigated by cyclic voltammetric method. The result indicated that one oxidation peak was observed on the modified electrode and no reduction peak was found,which showed that the electrochemical reaction of BPA on the electrode was an irreversible process. The oxidation peak currents were linear to v1/2 in the range of 40-280 mV?s-1,indicating that the electrode process was controlled by diffusion. The effective area and electron number of GNP- ［BMIM］PF6/GCE were calculated to be 0.338 cm2 and 2，respectively. The peak current was linear over BPA concentration in the range of 5.0×10-8-2.5×10-4 mol?L-1 with a correlation coefficient of 0.997,and the detection limit was 4.42×10-8 mol?L-1. The proposed method was successfully applied in the determination of BPA in real water samples with spiked recoveries of 99%-105%.