A direct-type back light module, a diffuser plate and a method fabricating the same are provided. The direct-type back light module includes a lamp box, a plurality of light sources and a diffuser plate. The light sources are arranged in the lamp box to serve as a surface light source. The diffuser plate is disposed in the lamp box above the light source. In addition, a plurality of micro bubbles is distributed in the diffuser plate to diffuse the light incident on the diffuser plate. The method of fabricating the diffuser plate includes providing an injection molding apparatus and a diffuser plate material. Then, at least a diffuser plate material is injected to form the diffuser plate. In addition, a plurality of micro bubbles is formed within the diffuser plate material during the injection step.