Abstract: A detailed process inspection was conducted on the ore-dressing process of a large copper-molybdenum mine in Xizang. By utilizing process mineralogy studies， the reasons for losses were identified. Based on this， measures such as introducing powerful collectors， ore slurry dispersants， or conducting ore slurry open-circuit tests， enhancing the effective recovery of 2 particle size products of +0.100 mm and -0.010 mm， are proposed. It is expected to increase the copper metal recovery rate by 3-5 percentage points， providing guidance for optimizing the ore-dressing process indicators， and laying a foundation for further "improving quality， controlling costs， and increasing efficiency" in the copper-molybdenum mine.