In order to satisfy the need of drilling, we research and develop high-temperature drilling liquid thinner, which is convenient to carriage and usage. It is a kind of black mobile solid powder which has the excellent nature of lowing stick and function of fastening wall against collapse. It also has function of disperser, lubrication, and antifoaming to the drilling fluid system, and control hydrating shale and improve mudding function of drilling fluid. Its maintaining time last long after dealing the mud. This kind of product is green and environmental Protection with non-toxic, and non-pollution.