It studies the hidden rules of car styling and the attribute of styling surface. Based on the classification of styling surface， it is found that the treatment of styling surface in car design is more complicated than ever； then the reflective attribute is closely observed， and its cause of formation and the examination method are studied. Styling surface has became an important part of style treatment in car design， while the reflective attribute is the main reflective of surface attribute，which is also an important part of car aesthetics. The research on styling surface contributes a lot to the understanding of the domain knowledge of car designers.