Located in the western part of Inner Mongolia, the Yabulai Mountain possesses extensively exposed intermediate-felsic plutons and some felsic volcanic rocks. Zircon U-Pb dating indicates that the granitic rocks from the Yabulai Mountain were formed in the Early to Middle Permian, as evidenced by the data from granodiorite (280±1 Ma), K-feldspar granite (286±1 Ma), tonalite (272±1 Ma), and dacite (275±2 Ma). In the K-feldspar granite, only a few zircon grains show positive εHf(t), and εHf(t) of most zircons is below 0, implying that some juvenile crustal materials or depleted mantle materials were involved in the generation of the rocks. In granodiorite, tonalite and dacite, zircons are all characterized by εHf(t) lower than 0. Zircon Hf isotope indicates that the sources of these igneous rocks were mainly old crustal materials, and this feature is similar to that of felsic igneous rocks from cratons. The Early Permian granodiorite and the Early Permian K-feldspar granite share similar major and trace element compositions, and REE patterns of granodiorite and K-feldspar granite are high in LREEs and low in HREEs, with weak to moderate Eu negative anomalies. The Middle Permian tonalite exhibits positive Eu anomaly and higher Sr/Y ratios (>300) than the granodiorite and the K-feldspar granite. The high Sr/Y ratio feature of the tonalite suggests that the tonalite might have been generated in the lower crust, with no assimilation/contamination of country rocks or fractionation of felsic magma in the upper crust. Because the presence of plagioclase, amphibole and biotite cannot significantly affect the Sr/Y ratio of the equilibrium melt, the differences of geochemistry between the granodiorite, K-feldspar granite and the tonalite may be attributed to the fact that the source of the tonalite was deeper and the garnet was present in the source. Combined with previous studies, the authors hold that the Permian magmatism probably formed a nearly EW-trending magmatic rock belt along the whole northern margin of North China Craton (NCC) and Alxa Block, and the Permian igneous rocks in the Yabulai Mountain might have been formed in a collision or post-collision setting during the convergence of the Zongnaishan-Shalazhashan and Yabulai-Nuoergong-Honggueryulin belts.