Abstract: The numerical simulation on shear stress of Al₂O₃/Al₂O₃ joints brazed with the Al₂O₃ particles reinforced composite filler materials is processed. And then the effect of Al₂O₃ particles on residual shear stress of ceramic joints is researched. The results show that the maximum shear stress appears in the interface between ceramic and filler materials. The Al₂O₃ particles in composite filler materials can decrease the shear stress of ceramic joints and the effect on decreasing stress heightens with the increase of the volume percent of ceramic particles. Moreover, the residual shear stress decreases with the increase of thickness of filler materials. The results of shear experiment on Al₂O₃/Al₂O₃ joints show that the shear strength increases with the increase of the volume percent of ceramic particles when the volume percent changes from 0% to 15%, which verifies the rationality of the results of numerical simulation.