Abstract: Comprehensive techno economic evaluation of an ore dressing plant is actually a decision-making issue concerning multiple attributes.Considering the fact that different decision-making methods often lead to different results,a multi attributes combination decision-making method is introduced to conduct the task of comprehensive techno economic evaluation of ore dressing plant.With the new method,evaluation results become more scientific and reasonable.Some examples mentioned in the paper show clearly the reasonability and practicability of the method.