An exemplary backlight module includes a light source and a light guide plate. The light guide plate includes a light incident surface positioned for receiving light beams from the light source, a bottom surface adjacent to the light incident surface, reflective structures provided on the bottom surface, and a light emitting surface configured for emission of the light beams. Each of the reflective structures partially overlaps corresponding adjacent reflective structures at one side, and is partially overlapped by corresponding adjacent reflective structures at an opposite side. A liquid crystal display including the backlight module is also provided.