Abstract: With the multi-layered composite filler composed of Ag-Cu-Ti+Mo brazing alloy, copper foil and Ag-Cu brazing alloy, Ti(C,N)-based cermet and 45 steel was joined by vacuum brazing at different temperatures (890, 920, 950℃) for different times (10, 20, 30 min). The optimum brazing temperature and holding time were determined on the basis of cross-section morphology and shear strength of the joint. The microstructure on cross-section of the joint brazed with the optimum process was analyzed. The results show that with the increase of brazing temperature or the holding time, the interface reaction layer between the Ag-Cu-Ti+Mo brazing alloy and the cermet was thickened. The amount of Cu-Ti intermetallic compound in the reaction layer and that of Cu-based solid solution in brazing alloys at both sides increased. Also the shear strength of the joint increased and then decreased. The optimum brazing process was as follows:brazing temperature of 920℃ and holding time of 20 min. The joint obtained with the optimum process had the largest shear strength, whose structure was composed of Cu₃Ti₂+Ni₃Ti intermetallic compounds, Ag-based solid solution+Cu-based solid solution+Mo+CuTi intermetallic compound, Cu, and Ag-based solid solution+Cu-based solid solution, in order from the cermet to 45 steel.