Abstract: A computer-aided method of obtaining a preliminary ply model of a composite component to be used in the manufacture of industrial parts by stacking and joining a plurality of plies of composite materials, comprising the following steps: a) obtaining from stress calculations a ply stacking sequence for the component subdivided into panels; b) automatically generating a stacking table containing the ply sequence for each different zone (defined by its ply sequence); c) automatically generating a grid table; d) optimising said stacking table; e) performing the plies drop-off distribution by means of a tool that allows carrying out said distribution automatically according to a predetermined staggering rule; f) obtaining an output table containing the data required for representing the ply model in a CAD program.