The study of metamorphic volcanic rocks of Yaolinghe Group widely distributed in South Qinling tectonic belt is very important in determining the attribute of South Qinling tectonic belt and even the evolution process of the whole Qinling orogenic belt. Results of this study show that Yaolinghe Group possesses different rock assemblages. This conclusion is based on petrochemical and geochemical characteristics in different areas obtained from exploration of metamorphite assemblages and initial rocks as well as analyses of petrochemical components, rare earth and trace elements in Yunxian-Yunxi (Hubei), Shangnan (Shaanxi),Zhen'an, Fenghuangshan, Ankang and other areas. Studies of metavolcanite obviously show that Yaolinghe Group in the center of Ankang-Wudang area is an intraplate tholeiite-partial alkali basalt group formed in a pull-apart intraplate (riftbasin) tectonic setting, whereas Yaolinghe Group in Shangnan, Zhen'an and Fenghuangshan areas are of calcalkali basalt-island arc tholeiite series formed on the edge of the convergent plate-island arc. There must have existed two tectonicregimes in South Qinling region in the period of 650～800 Ma. 