Abstract: Ag-25.5Cu-27Sn brazing filler metal was prepared by magnetic pulse compaction using pure metal powders as raw materials, and sintered at 100-500℃ for 30 min. The effects of sintering temperature on relative density, phase composition, microstructure, melting property of the brazing filler metal, and on the micromorphology and tensile strength of the brazed Cu joint were studied. The results show that the relative density of the brazing filler metal first decreased then increased with the increase of sintering temperature. The relative density of the brazing filler metal sintered at 400℃ was higher than that of the unsintered brazing filler metal, and the stable phases of ε₁-Cu₃Sn and ε₂-Ag₃Sn were formed. The melting temperature of the brazing filler metal was improved by sintering, and that of the brazing filler metal sintered at 400℃ was about 4℃ lower than that sintered at 250℃. With 400℃ sintered brazing filler metal, the number of pores in weld of the brazed Cu joint was relatively small and the microstructure was relatively homogeneity and fine. The tensile strength was 16% higher than that of Cu joint brazed with the unsintered filler metal.