Abstract: The zinc and cassiterite grade is low in copper zinc cassiterite polymetallic ore of maincopper ore in Dulong Yunnan,whose comprehensive recovery is difficulty of copper zinc cassiterite mineral.The cassiterite recovery rate is low and the zinc content was unable for recycling of production cost high that benefits at a loss in production practice.Through slime removing to deal with copper tailings in turn under the current condition,meanwhile the zinc sulfide sorting process turns Zn-S preferential flotation into Zn-S mixed flotation and separation,getting with the grade of zinc 41.15%,the zinc concentrate recovery rate 38.32% of production indicators in turn under the condition of production costs fell by 50%,implementing the low-grade zinc mineral recovery of the economy and efficience,optimizing the cassiterite process flotation.The grade of cassiterite was improved to 32.47% from 41.14%,the comprehensive recovery of cassiterite was improved to 27.76% from 38.05%,and the cassiterite indicators improved remarkably,implementing the low-grade zinc and cassiterite content comprehensive recovery form copper railings,improving the mineral resources comprehensive utilization and increasing the concentrator economic benefit.