The pyroxenes in the Emeishan basalts studied are all clinopyroxenes. in the alkalic vol-canics from Dongchuan district diopsides are dominant, which show the characters of alkalic pyroxenes but with relatively low abundances of such incompatible elements as light rare earths and titanium, and were presumably crystallized under higher oxygen fugacities as indicated by their higher propotions of Fe3+. The basalts from the Panzhihua petro-zone are characterized by diopsidic augites. The pyroxenes from the remaining sections and localities investigated are augites, whose chemical compositions show an evolutionary trend characteristic of calcium-rich clinopyroxenes in tholeiitic basalts. As compared with the clinopyroxenes from the Panzhihua petro-zone and western petro-province, those from the eastern and central petro-provinces are more evolved in composition. The "other" cation pairs involving Ti are universally important in the Emeishan basalts, probably implying that their formation has nothing to do with any volcanic arc.