Alumina ceramic is a alumina (AL2O3) as the main materials, used for thick film integrated circuit. Alumina ceramics have good conductivity, mechanical strength and high temperature resistant properties. Alumina ceramic is a kind of extensive use of ceramic. Because its superior performance, in modern society application has been more and more extensive, satisfy in daily and special performance needs. Electrical and electronic ceramics characteristics: product good consistency and loss at high frequency. Small insulation performance is strong, dielectric constant small, high mechanical strength, good air-tightness, thermal stability chemical stability is good.