Abstract: The bonding between Ti(C,N)-Al₂O₃ ceramic matrix composite and 40Cr steel was conducted using liquid phase diffusion bonding with auxiliary pulse current. The change on interfacial microstructure and dissolution of base materials caused from auxiliary pulse current was researched, and the effect of bonding parameters on joint strength and fracture surface during four-points bending tests were also investigated. The results show that the strength of the resultant joint reached 231-272 MPa with auxiliary pulse current during diffusion bonding in a shorter bonding time. The bonding temperature could be reduced to release the residual stress in the joint, and the interfacial reaction in the joint could also be controlled to decrease the amount of intermetallic compounds and increase solid solution. The diffusion process of active Zr element to ceramic matrix composite materials was suppressed to reduce the amount of ceramic particles dissolved in the weld, which is a key factor to improve the strength of welded joint.