Abstract: The relatively low SiO2 and high A12O3，K2O，TiO2，MgO values and the ratios of SiO2／A1203，SiO2／MgO，SiO2／(K2O+Na2O)of the seleniferous rocks in Shuanghe are similar to those of the volcano-sedimentary cherts．As seen in the TiO2-A12O3 and(K2O+Na2O)一A12O3 diagrams，the data points mainly fall within the field of volcano-sedimentary cherts．The ratios of A1／(A1+Fe+Mn)(0.72 in average，with a maximum of 0.93)are higher than the values of the biogenetic siliceous rocks．The extreme enrichment of Se，Te，Mo and high contents of V，Ag，Sb，Cr also show some igneous characteristics．It is more important for the first time to discover the argillized pyroelastie breccia in the interlayers of seleniferous rock in Yutangba digging．The data points of the seleniferous rocks in P2 05一Y correlation diagram along with the ratios of Co／Ni< 1 and U／Th > 1 all show some hydrothermal characteristics．REEs are characterized by total similarity inΣREE concentration with Emeishan basalts，relative enrichment in HREE，negative Ce anomaly and gradually increasing NASC-normalized value with increasing atomic number of REEs．Generally，it can be judged from the analytical results of major elements，trace elements and REEs that the genesis of the seleniferous rocks in Shuanghe was closely related to the Permian volcanism synchronous with eruption of Emeishan basalts and belonged to the volcanic detrital sediment and accompanied by the hydrothermal activity.