Distributed along the Jinshajiang-Ailaoshan fault zone, the alkaline-rich porphyry zone was formed in Paleogene (from 62 Ma to 23.18 Ma). The petrochemical and isotopic geochemical characteristics of the porphyriessuggest that the tectonic setting is predominantly shear-compression and locally extension, uplifting (diapir) of the Protererzoic basement metamorphic rocks of Mt. Cangshan is also a product of the same setting. The alkaline-rich porphyry results from upward erosion of deep EMⅡfluid contaminated in different degrees by crustal components. Porphyries keep a trace of both Yangtze block and Gandwana continent, as shown by lead isotopes.