Absorber-microwave material Al-Si alloy powder was used as interlayer to join the 95-Al2O3 ceramics. The behaviors curves of time-temperature for Al-Si alloy interlayer and 95-Al2O3 ceramics at different microwave power were researched. The interlayer morphology of the joints region was characterized by SEM and the element and phase components were analyzed by EDX and XRD. The results indicated that the loact heating around 95-Al2O3 ceramics could be achieved by microwave sintering. The joint interfaces of Al-Si/95-Al2O3 formed at microwave 2KW/20min→0KW and the joint mechanism of 95-Al2O3 ceramics was transient liquid phase diffusion bond.