Located in the eastern part of the Central Asian Orogenic Belt, the Jalaid Banner of Inner Mongolia is considered to be controlled by the eastern extension of Erlian-Hegenshan fault. It contains the key information of the subduction and extinction process of the Paleo-Asian Ocean. However, the studies of the Ophiolite mélange in this area are relatively weak. In this study, the ophiolite mélange, tonalites-trondhjemite and alkali feldspar granite assemblages related to island arc environment were found in Shabaertu region. Zircon U-Pb dating of the ophiolite mélange shows that their ages are 279.2±3.3 Ma and 278.2±1.7 Ma, respectively, indicating their emplacement in Early Permian. The ultramafic rocks have low SiO₂ content (43.54%~46.38%), low Na₂O and K₂O values, but rich MgO, with Mg^# of 89~94, showing the features of depleted mantle-transitional mantle, which originated from about 70% partial melting of garnet lherzolite. They belong to the supra-subduction zone type (SSZ). The tonalite-trondhjemite is a typical O-type adakite and belongs to the metaluminous and calc-alkaline series, relatively rich in Al₂O₃ and Sr (averaging 600.00×10^-6), but low in Y (averaging 12.50×10^-6) and Yb (averaging 1.18×10^-6), suggesting that they originated from partial melting of the low-K oceanic crust basalts in subduction environment. The alkali feldspar granites are rich in silicon and alkali and low in iron and magnesium. They have high positive εHf(t) values (averaging + 18.9) and are located above the depleted mantle line, with the in-situ zircon Hf isotope one-stage and two-stage model age equal to or less than the crystallization ages of rocks, so they might have been derived from the island arc type juvenile crust. The Shabaetu ophiolite mélange represents the product of intra-oceanic subduction in the early Middle Permian, implying that the Paleo-Asian Ocean was not closed in the early Middle Permian, and the closure time should be at least after the Middle Permian.