Heqing manganese deposit in Yunnan Province is located in the southwestern margin of the Yangtze platform, adjoining the Sanjiang geosyncline in the west. The deposit formed in the transition zone of the two tectonic units. Ore minerals are mainly psilomelane, rhodochrosite, manganite and hausmannite, containing a small amount of pyrolusite and nsutite. Ore minerals deposited in media property zone (from acid to alkaline and from reduction to oxidation), and isotope studies support that the biogenic methane might participate in mineralization.