Diamond drilling is a main method in geological exploration, the drilling equipment, drill bit, drilling technology, drilling operation and production management are important in diamond drilling production and the technical and economic indexes of the drilling are more closely related to the service performance of drill bits, so all of these have become a concern. Russian doctor of technical sciences Kubasov V.V. and others have made a lot of studies in improving diamond bit matrix service performance and achieved good technical and economic effects. This paper introduces the research contents and achievements in selective crushing of low grade diamond, thermal treatment of diamonds, cryogenic treatment of diamond bit, control technology of matrix performance and so on.