Abstract: The volcanic terrains in Tengchong, Yunnan are famous Cenozoic volcanic terrains in China. The (examination) of the petrography shows that the volcanic terrains in Tengchong are typical of the basalt-(andesite)-(dacite) arc volcanic rock associations of the calc-alkaline series. These volcanic rocks were erupted during the late Pliocene to late Pleistocene when the Tengchong region was developed into a continental intraplate environment. The Tengchong arc volcanic rocks were formed at least at 60 Ma in response to the termination of the subduction in this area.