In recent years, with the development of science and technology, nanotechnology has begun to be applied to all aspects of our lives, and the fields involved are also increasing. Especially when this emerging technology meets our traditional industry ceramics, the combination of the two improves the product added value of the ceramic industry. Alumina ceramics have a series of excellent characteristics, such as high hardness, high temperature resistance, oxidation resistance, corrosion resistance, high electrical insulation and low dielectric loss. Therefore, they play an important role in mechanical, chemical, electronic, medical, aviation and national defense. The comprehensive mechanical properties of alumina ceramics prepared by traditional ceramic preparation process, such as large grain size, high strength and toughness, are low, which to some extent limits its wider application. Adding nano Al203 powder to coarse grained alumina ceramics can improve the first sintering performance of alumina and reduce its sintering temperature. Adding nano Al2O3 powder into alumina micro powder can reduce the pores of micro Rice noodles by filling nano powder into the pores of micro powder during the molding process; With the increase of molding pressure, the number of close contact pores between powder particles decreases. Increasing the density of the ceramic green body is beneficial to sintering, and also improves the density of the sintered alumina ceramics. The Vickers hardness and fracture toughness of sintered alumina ceramics increased with the increase of the amount of nano-al2O3 powder and the increase of molding pressure. Therefore, it is considered to add nano-aluminum oxide powder into the micron aluminum oxide powder to make the green body obtain better particle size distribution after molding, reduce the pore size of the ceramic green body and improve the sintering activity of the ceramic; At the same time, in the process of dry pressing, the molding pressure is increased to facilitate the discharge of pores and reduce the number of pores, so as to obtain relatively dense ceramic billets and finally obtain Al2O3 ceramics with excellent performance.