Abstract: Micrometer ZnNb₂O₆ powders were synthesized via co-precipitation process and the ZnNb₂O₆ ceramics were prepared by microwave sintering and conventional sintering after the powders being suppressed. The influence of two kinds of sintering way on phase composition、relative density、microstructure、microwave dielectric properties of ZnNb₂O₆ ceramics were studied. Results showed that the ZnNb₂O₆ powders exhibit fine and homogeneous like-rob particles with the size of 150 nm. Microwave sintering method can decrease the sintering temperature by about 150℃ and the sintering time by about 1. 5h,which can effectively inhibit Zn evaporation; Moreover,the ZN ceramics with the size of 6μm prepared by microwave sintering show more uniform,fine-grained microstructure,less pores. The value of ε_r and Q × f of ZN increase with the increasing of sintering temperature,and the corresponded value increases by 4. 6% and 15. 6% respectively,compared with conventional sintering. The dielectric performances were analyzed more systematically in theory.