Ceramic metallization is a kind of welding between ceramics and metals by sticking a metal film firmly on the surface of ceramics, thus synthesizing the chemical properties of ceramics and metals. Ceramic metallized products of ceramic materials :96 white alumina ceramics, 93 black alumina ceramics, aluminum nitrous ceramics. The main types are metallized ceramic substrates, which can also be metallized ceramic substrates. Metallization methods include thin film method, thick film method and so on. Advantages: precision product size, small warpage; Strong binding force of metal and ceramics; Metal and ceramic joints dense, better heat dissipation. It can be used in LED heat dissipation substrates, ceramic packaging, electronic subgrade board and other fields. In order to ensure the quality, before the metallization and sealing of ceramics, the connected ceramics should be processed in accordance with certain requirements, so as to achieve the condition of no burr, no bulges, smooth and clean ceramics.