The diffusion bonding between Ti/Ni was carried out by Field Activated Diffusion Bonding process (FADB). The formation of new phase during interfacial diffusion reaction between Ti/Ni and its effect on bonding strength were studied. The microstructure, phase component and element distribution across interfaces were observed and determined by SEM and EDS. The shearing properties of bonded interface were evaluated by a universal testing machine. The results indicate that complete metallurgical bonding between Ti/Ni has been reached, which is composed of intermetallics of Ni3Ti, NiTi2 and NiTi in order. When the diffusion bonding temperature is as high as 750 oC, Ti shows good performance of superplasticity and high diffusivity, which promotes Ni3Ti to transform into Ti-rich layer during diffusion bonding. The formation of Ti-rich layer improves the shearing strength of interface. The shearing strength of the Ti/Ni interface increases with increase of current, and when the current is 930~1200 A, it reaches 90.54 MPa