Magnesium oxide stabilized zirconia ceramics, zirconia toughened ceramics prepared by magnesium oxide as stabilizer. Cubic zirconia and metastable tetragonal zirconia ceramics can be prepared according to the different content of magnesium oxide stabilizer and preparation process. By controlling the growth of tetragonal crystal nucleus, magnesium oxide partially stabilized zirconia ceramics with the best bending strength and fracture toughness can be obtained. Its application is roughly the same as yttrium oxide stabilized zirconia ceramics. And more because of its unique thermal shock resistance. Widely used in metallurgy, steel and petrochemical industries. It can also be used to manufacture special ceramic cutting tools, standard measuring tools, mechanical seals, stamping dies and all kinds of wear-resisting parts in the machinery and textile industry.