Abstract: The effect of a molybodnum net interlayer in Al₂O₃/Nb brazed joint on the thermal shock behaviour of the interface was studied for the first time. The existence of the net in Al₂O₃/Nb interface was able to increase the thermal shock resistance of the joint considerably. When it was brazed with Ni51Ti49 and Cu52Ni18Ti30 solders separately and quenched into water from 700,the thermal shock resistance of the joint with the net was raised by more than 180% and 130% respectively, compared to those of the joints without a net. The fracture topograph of the joints with the net was very different from those of the joints without a net. It was supposed that the existence of a net interlayer could markedly reduce the residual stress in the brazed interface.