Based on newly collected geophysical data, this paper analysis upper, middle and lower crust structures, viewing mass movement processes in Inner Mongolia. The terrain amalgamation belongs to a lower- pressure and longer period of geological process, with the central region of Inner Mongolia as the typical representative. We derive the lithospheric structures in Inner Mongolia Plateau by the integrated analysis of comprehensive geophysical data. This area now includes two Proterozoic terrains，the south- west Amur- Xingan terrain and the Xilinhot terrain, and the ancient North China Craton. The Sorren Mountain- Silamullen River fault is a suture belt between the Xilinhot terrain and the North China Craton. The collision of the two occurred in the Permian, resulted in the closure of the southern branches of the ancient Asian ocean, and formed the Suolun Mountain- Silamullen suture belt and the north- edge subduction zone of the North- China Craton. After the closure of the ancient Asian ocean, the North China Craton continued to subduct towards the land- island below the Xilinhot terrain, forming a north edge subduction zone of North China Kraton with a width of 60～120 km. The subduction zone formation tilts northwards, causing that the upper crust deformed severely, and the lithosphere mantle ruptured and filled the water. In the Carboniferous period, Xilinhot terrain was located in the south of Amur- Xingan terrain in the southern ancient Asian ocean, as a subduction belt linking to island arcs. In the Permian, the Xilinhot terrain was located in the northern subduction belt of the North China Craton, also linking to island arcs, with frequent magma invasions. After the Mesozoic, the crust of Xilinhot terrain termed to extension, mantle- source magma invasions acted strongly, resulting in a good mineralization in the Xilinhot terrain and its surrounding areas.