The present invention relates to a method for equalizing the orientation of fillers and/or distribution of fillers in a molding compound comprising filled plastic material of an injection molded part. A method of this type is required in particular during injection molding.The method according to the invention is characterized in that the injection mold and the molding compound are supplied with sound during injection molding in the injection mold. The sound has a frequency in the range of the spectrum of the first ten natural frequencies of the filler-matrix system. By supplying with this sound, the fillers, for example fibers, are distributed within the injection molding compound in a more isotropic manner with respect to their orientation and distribution so that significantly better mechanical and optical properties of the injection molded part are produced.