a process of producing a kaolin product for paper coating includes mining kaolin ores by hydromechanization and then producing kaolin slurry ; classifying by centrifugal sedimentation ; chemical bleaching ; eliminating iron ions by circular rinsing ; removing water by pressure filtration ; producing slurry by dispersing filter cakes , in which complex dispersants , ph adjustor and intercalator are added ; delaminating ; classifying by vibrating sieve ; and spray drying : spray driers are restructured by adding insulating layers on packing auger , elevator scoop and bunker at first ; the kaolin slurry j which has passed through vibrating sieves is dried in high speed centrifugal spray drying tower and the moisture of kaolin powder is controlled in 3 wt . %- 5 wt . %, and the kaolin product for paper coating is obtained . the process characterizes in stable properties , high efficiency , and high viscosity content and fine particle size of the kaolin products produced .