Abstract: Wettability and flow-ability experiments of a high temperature brazing filler metal BCo45NiCrWB were studied.Dynamic analysis of brazing process was studied by a STMD-300 surface tension test apparatus.Microstructures of brazed joint with different brazing processes were studied.Microstructure of brazed joint was analyzed by optical microscope.The element distribution of brazed joint was analyzed by electron microprobe.Rupture life of brazed joint at the condition of 980℃/132 MPa was tested.The best brazing process of BCo45NiCrWB alloy was established.The brazing parametens are 1220℃/2 h, +1080℃/4 h +900℃/16 h, all by argon quench.Results show that the high temperature brazing alloy BCo45NiCrWB has excellent process brazeability.At the condition of 980℃/132 MPa the rupture life is more than 60 hours.