Abstract: Diffusion bonding of 61-filament high-temperature superconducting tapes has been carried out.The effects of bonding temperature, holding time and bonding pressure on the superconducting properties of the joints were studied.And the microstructures of the joint were examined.The result shows that bonding temperature has a great influence on the superconducting property of the joint, and the effects of holding time and bonding pressure are limited in a certain range.The optimum joints are obtained under the parameters of 820℃, 120 min and 3 MPa, which reach 65.9% superconducting property of the original superconducting tapes.Microstructures of the joint show that the interface is compact structure and composed of Bi-2223 phase and a small amount of Bi-2212 phase.