A method is proposed for the determination of process parameters in a thermal spraying process, in which particles are melted or made plastic or vaporized by means of a thermal spraying apparatus (1) and are transported by a flow of fluid (G) to a substrate (6). In said method an operating model is constructed for the thermal spraying process or for the thermal spraying apparatus, with which a simulation of the thermal spraying process can be done and which includes a flow mechanical model and also an electromagnetic model, wherein the flow mechanical model and the electromagnetic model are coupled together and at least one process parameter is determined by means of the operating model.