The invention relates to a method for optimizing a mixture of components for the production of a target product by means of spectral analysis, preferably by means of spectral analysis (topological) in the near infrared region (NIR). The aim of the method is to produce a target product by batch mixing and/or continuous mixing of the “n” components thereof, on the basis of different flows of said components with controlled concentrations and/or flow rates, said target product requiring a set of ranges of values of physiocohemical characteristics for the commercialization thereof. According to the method, a batch mixer or a continuous mixer is supplied with said components with controlled concentrations and/or flow rates.