The diabase exposed in Luodian area，southeastern Guizhou Province，belongs to tholeiite series．The major elements of the diabase are characterized by high TiO2 (2.36%～2.57%)，high CaO(9.40%~10.31%)，low MgO(5.65%~6.93%)，low alkali and Na2O>K2O；the diabase have a higher content of ΣREE(164.9×10-6~187.3×10-6) with a remarkable fractionation between LREE and HREE reflecting the enrichment of LREE and the depletion of HREE.Meanwhile，the testing result pronounces a significant positive Eu anomaly and the chondritenormalized distribution curve is right inclined．The UPb dating result from zircons in the diabase samples yields a concordant lower intersection age (tested by LA-ICP-MS)，255.0±0.62Ma, which may represents the rock mass crystallization time．Combining with the regional geology analysis, we believe that the diabase of Luodian area possibly originates from the partial melting of the peridotite approaches in the primitive mantle，and the magmas probably suffer from the contamination of crust materials during the rapid rising process．The Luodian diabase has a similar geochemistry characteristic with the Emeishan basalt，and its formation age is nearly at the same time with the main eruption period of Emeishan basalt．The comprehensive analysis proves that the late Permian diabase from the southeastern Guizhou Province is the product of polymorphism magmatic activities of the Emeishan basalt，and the Luodian—Wangmo area of the southeastern Guizhou Province lies in the eastern boundary zone of the Emeishan basaltic magmatism．