On basis of geological features, PGE-bearing black rock series can be divided into two types, (1) no relationship to volcanic action or magmatism; (2) relationship to volcanic action or magmatism.Under the conditions of variant geological underground, there are some similar features of geological PGE distribution, but there are also some differences.PGE ratios can not only show the geochemistry action of platinum-group element, but also explain the geological evolution rules of PGE in different environment.