Base upon a 7.5km measured geological profile across Yangla mining area and lithostratigraphic subdivision, the stratum of Yangla mining area called Gajinxueshan Group, which thought to be gigantic and thick sediments of oceanic basin in Permian, now proved to be consists of tectonic malange from Devonian to Permian. For reasons that initial cracking, oceanic spreading, oceanic subduction, and collision orogency that Yangla area experienced, the greenschist facies metamorphism which rocks widely underwent and the lack of ancient-life fossils, the reconstruction of protoliths and strata sequence is intangible. On the basis of research of predecessors and our discovery of conodonts, considering Sedimental features and evolutionary history of Jinshajiang ocean, we subdivide the strata into Early Devonian Jiangbian Formation rock massif, Middle Devonian-Carboniferous rock massif and Permian rock massif and we discussed its tectonic evolution.