[en] The Duobengou basin is located on the northern margin of the North China Craton. The SHRIMP zircon U-Pb dating yields ages of (156.8 ± 1.8) Ma (MSWD = 1.45) for thyolites indicated that they were all formed in early Late Jurassic age. The thyolites are typical enrichment in SiO₂, K₂O, but lack of Al₂O₃, Cao and MgO contents, and strong negative Eu anomaly as well. Besides, relative enrichment in Rb, Th, U, Pb, Zr, Hf, but depletion in Ba, Sr, P, Ti and so on, with the characteristics of A-type thyolite. (⁸⁷Sr/⁸⁶Sr)_i = (0.706749∼0.714887), ε_Nd(t) = (-11.23∼-8.09), T_DM2 = (1601∼1855 Ma), (²⁰⁶Pb/²⁰⁴Pb)_t = 16.53∼16.93, (²⁰⁷Pb/²⁰⁴Pb)_t = 15.31∼15.39, (²⁰⁸Pb/²⁰⁴Pb)_t = 36.96∼37.31, ε¹⁸O_v-SMOW = 5.1%∼6.0%. According to the assemblages and geological age of rock and characteristics of Isotopic composition, it is suggested that the volcanic rocks of the Duobengou basin should be classified into the Xinmin Formation. Otherwise, it is inferred that the fault on the northern margin of the North China may pass from the north side of the basin. Combing with the geological characteristics of known uranium deposit, the uranium exploration Hongshanzi U-Mo deposit can be a reference in the process of uranium exploration. (authors)