Abstract: We compared the lead-zinc ores' properties from two places, Sichuan and Inner Mongolia. Predecarbonization was used to remove carbonaceous material in the two ores. And then the selective flotation for lead and zinc was adopted. We compared the effects coming from the process flow above. The results showed that the carbonaceous material in Sichuan Longtang ore was organic carbon and in Inner Mongolia Tianbaoshan was graphite. Using predecarbonization to the two ores could remove carbonaceous material. The carbon product 1 gained from Longtang ore could be mixed with zinc concentrate. But the carbon product 2 gained from Tianbaoshan ore could not be utilized at all.