Abstract: For a coal washing plant there are always two key issures:what kind of product structure can bring biggest profit?This is an issue of product structure optimization.How can the best product structure be realized from the point of view of technology.This is an issue of technological parameters eptimization.A linear planning model for product structure based on simulation method using computer is introduced to the coal washing plant.The technique introduced in the papre can be adopted when designing power coal washing plant and be taken by engineers for reference when they design coking coal washing plant.