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In this paper,lead-free ceramics(1-x)Na0.5K0.5NbO3-xBa(Mg1/3Nb2/3)O3((1-x)NKN-xBMN)with x = 0–0.06 were prepared by the conventional solid-state reaction processes.The depence of microstructures on the electrical properties of the NKN-BMN ceramics were first studied.X-ray patterns showed a perovskite phase for all compositions.NKN-BMN ceramics show orthorhombic structures when x <0.03 and have phase transition to pseudocubic phase by increasing the amounts of BMN(x>0.03).