In this paper, Au nanoparticles are synthesized by solution method. The effect of these nanoparticles on the Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_y superconductor properties has been investigated. The critical current density, activation energy and room temperature resistivity were measured by the standard four-probe method. The microstructure and morphology of samples have been studied by X-ray diffraction, Scanning Electron Microscope and Energy Dispersive X-ray. The results of X-ray diffraction patterns show that the low amount of Au and annealing time of 72h enhance the fraction of Bi -2223 phase. Also crystallography studies showed that the gold has entered the superconductor's structure and the results were in consistency with superconductor's SEM images.