Abstract: With study on the distribution characteristics of manganese in different geological tectonic units, strata of different times and different rock types, it is considered that the Western Liaoning platform-depression and Songliao depression could be important source for manganese ore. Combined with the characteristics of manganese-rich strata and geological features of manganese deposit in Liaoning Province, the study shows that the manganiferous limestone of Tieling Formation can be regarded as the significant indicator for sedimentary manganese deposit. Western Liaoning can be classified as a large shallow sea sedimentary manganese metallogenic prospect area. In eastern and southern Liaoning, where Cretaceous Mn-rich shale is distributed, it is expected to find medium-large lacustrine facies sedimentary manganese deposits. Volcanic hydrothermal manganese deposits can be prospected on the west of Chaoyang and Jinxi area. Their source beds are the quartz sandstone of Chuanlinggou Formation, Mn-bearing fine sandstone of Gaoyuzhuang Formation and Mn-rich carbonate rocks of Dahongyu, Tieling and Hongshuizhuang formations. The ore-forming fluid is supplied by acidic magma.