Zirconia toughened alumina ceramics (ZTA) are material of white, wear-resistant, corrosion-resistant and good chemical stability. Alumina ceramics have high hardness and zirconia ceramics have good toughness. The most commonly method for toughening alumina ceramics is zirconia toughening. Adding an appropriate amount of zirconia to alumina, the two materials form an excellent composite material with high strength and high toughness, with better physical and chemical properties, and a wider range of applications. ZTA has higher flexural strength, fracture toughness and excellent wear resistance. According to the special requirements of different users, the specific ratio of alumina and zirconia can be adjusted to obtain ZTA with different properties. The performance of zirconia toughened alumina ceramics is better than that of 95 alumina ceramics, and the price is much lower than that of zirconia ceramics; in many working conditions where alumina ceramics are not competent, ZTA shows a better cost performance than zirconia ceramics, and is widely used in mining, machinery, electronics, petroleum, chemical and aerospace,etc.