The Ti（C,N） cermet and 17-4PH precipitation-hardened stainless steel were brazed in vacuum using nickel-based eutectic filler BNi-7. The effects of brazing temperature and brazing seam thickness on the microstructure and shear strength of the brazed joints were investigated. BNi-7 filler had a strong dissolution ability to the binder of the Ti（C,N） cermet. This is beneficial to the wide distribution of melting point depressant （phosphorous） in the Ti（C,N） cermet side and producing a good interfacial bonding. The distribution zone of phosphorous in the Ti（C,N） cermet side that is adjacent to the brazing seam increased as the brazing temperature rose. A maximum shear strength of 454 MPa was achieved at a brazing temperature of 1100℃ and a brazing time of 60 min with a brazing seam thickness of 50μm.