The mineral characteristics of hard kaolin discovered in Tianyang,Guangxi,were analyzed.The Physical and chemical properties of the kaolin were studied by XRD,SEM,such as mineral and chemical compositions plasticity,viscosity concentration,density and crystal morphology.After refining process the mass fractions of titanium dioxide and iron oxide in refined kaolin decreased significantly,its whiteness increased from 62.1% to 82.3%,its volume average particle diameter was controlled within 3 ~ 5 μm,its particle size distribution improved evidently.So the refined kaolin can meet the requirements to be applied in many different fields.The study provides the detailed basic data for follow-up development of the kaolin.