In the Huluntaolegai area of western Inner Mongolia, close to China-Mongolia border, several granitoid plutons occur in the Mesoproterozoic and Carboniferous country rocks, of which the Yinggete-Bagemaode pluton is the largest one. This pluton has greatly varied lithologies, composed of quartz diorite, granodiorite and granite, which contain abundant relicts of country rocks and have experienced intrusion of younger granites and pegmatites. According to previous data, the Yinggete-Bagemaode pluton may be Late Paleozoic in age, whereas other small plutons dominated by red granite and potassium feldspar granite such as the Kuchuwula and Yilian plutons, which occur within or to the west of the largest pluton, were possibly emplaced in the Mesozoic. Unfortunately, neither reliable chronological constraints nor geochemical data for these plutons are available. In view of this situation, the authors conducted a preliminary study of these plutons in order to determine their emplacement ages and geochemical characteristics. SHRIMP zircon U-Pb dating reveals that the Yinggete-Bagemaode pluton was emplaced at 313 ± 5 Ma (Late Carboniferous), and this pluton was cut by the quartz monzonite at 130 ± 2 Ma (Early Cretaceous), whereas the Kuchuwula and Yilian red granite plutons were emplaced at 277±2 and 278±4 Ma, respectively, suggesting products of Early Permian instead of Mesozoic magmatism. Geochemically, Yinggete-Bagemaode pluton shares characteristics of I-and A- type granites, with 10000 Ga/Al of 2.15～3.04 and negative Ba, Nb, Ta, P, and Ti anomalies, while the Kuchuwula and Yilian plutons are aluminous A-type granites, showing significantly negative Ba, Nb, Ta, P and Ti anomalies and high 10000 Ga/Al ratios (4.02～4.89). All the Late Paleozoic plutons are characterized by positive εNd(t) values (0.90～3.43), like the coeval granitoids in North Xinjiang, Mongolia, and Northeast China in this respect, and thus are indicative of crustal growth in the study area. In contrast, the Early Cretaceous quartz monzonite has significantly negative εNd(t) value (-8.71), implying a dominantly crustal origin, possibly derived from the Mesoproterozoic metamorphic rocks in the study area, with some involvement of depleted-mantle derived materials.