The application of approach of three-link-model exergoeconomic synthesis and optimization to spray drying system(SDS) is comprehensively and deeply explored and an exergoeconomic evolutionary method is put forward, which is suitable for SDS. Parti's model for the simulation of spray dryer is modified to facilitate the calculation and speed up. Based on the simulation and three-link-model, the author takes the temperature of exhaust as the determinative variable and gives an approach of exergoeconomic optuni...