The utility model relates to an optical plate, in particular to a multifunctional optical plate with both light-focusing function and diffusion function and capable of reducing moire interference, and a backlight module and an LCD which employ the optical plate. The optical plate comprises a prism plate support part and a prism shape part, a plurality of tiny scratches capable of scattering light are formed on at least one side surface of the outer surface of the prism shape part, and a lens with a refracting index larger than that of the prism shape part is arranged between the prism shape part and the prism plate support part. In the embodiment of the utility model, the scratches formed on the prism shape part can reduce light intensity difference on the left surface and the right surface of the prism plate, moderate moire interference, and further improve picture display consistency.