JD-80A by silane coupling agent surface treated calcined kaolin has a good compatibility with matrix, dispersibility and high purity, specific surface area, chemical stability. It mainly used in polyethylene, polyvinyl chloride, polypropylene, unsaturated polyester plastic, EPDA, special rubber, partial substitution of the silica, to improve the mechanical properties, process rheological properties, aging resistance, acid-alkaline resistance and electrical insulation properties of the products.