Abstract: Sinter-brazing process is a common joining process for powder metallurgy components and is ofen used in production of planetary gear carrier、reducer hub which need connection. The result of sinter-brazing are affected by condition of brazing material and sintering atmosphere. The effect of condition of brazing material and sintering atmosphere on sinter-brazing were discussed, the wetting angle and penetration depth were characterized by stereoscopic microscope .The results showed that brazing material pre-sintered at 800℃ and sintering in a endothermic atmosphere can achieve a well welding state.