A backlight module includes a light guide, a mixing light guide plate, and a plurality of light sources. The first light guide comprises a first side surface. The mixing light guide plate comprises an incident surface with anomalous surface and an emergent surface with fog surface. The mixing light guide plate is set on the first side surface. A plurality of light sources disposed corresponding to the incident surface, with light emitted there from and entering the mixing light guide plate through the incident surface then exits the mixing light guide plate through the emergent surface, finally, entering the light guide through the first side surface.