Abstract: Middle Permian volcanic rocks were discovered in the Mingshan area of eastern Pingle depression, and the rock type is mainly composed of alkali basalt, sub-alkaline basalts and andesitic basalt, called Mingshan basalt. The volcanic rocks are sandwiched between Mingshan Formation thin siliceous rocks and siliceous shale, with vesicular structure and a large number of amygdales, about 15m in thickness. The volcanic rocks are characterized by poor silicon, rich iron, high aluminum, low magnesium, Mg^# content ranging from 4.08 to 19.48, relative enrichment of high field strength elements Nb, Ta, Zr, Hf, significant enrichment of U, Th and light rare earth elements (LREE), and (La/Yb)_N content ranging from 3.58 to 72.53, with insignificant Eu depletion (δEu=0.42~0.85) and slightly rightly-oblique REE distribution patterns. Researches show that Mingshan basalt was probably formed in an active continental margin rift basin environment with light rare earth ore source bed; nevertheless, there also exists the evidence arguing that the Dongwu Movement caused the submarine volcanic eruption in South China.