This is a projecting board combined the function of being a white board and developer, this invention use acrylic resin, polyester, epoxy resin combined to be a bake lacquer by mixed with dayglo, hardener and silver powder, extinction powder . . . etc materials to complete this invention that can be spread on hard or soft boards by rolling or spray after baking, it also can be wrote on the surface by erasable marker and clean it properly, the effect of the light diffusion on the surface do not cause the light faint while projecting, it do not be affected by irradiation while turn on the light indoor or sunlight downpour, the developing effect on the surface can advance the function of projection, to raise the definition, brightness and contrast of projecting reflection, to use the single baking lacquer spray can reach the great value developing effect of writing on the surface, do not need to use multi-layers to save the producing cost. This product can be made projecting screen, white board, wall coverings, plank building material, or metal building material to satisfied any kind of demands.