The formation of the great rift valley in Daqing Mountain, Inner Mongolia, is the result of the combined action of long-term geological tectonic movements and external erosion. Firstly, tectonic movements (including plate collision and crustal extension) formed fault zones and primitive depressions, laying the foundation. Subsequently, external forces such as fluvial erosion, weathering, and gravitational collapse sculpted the landform, eventually creating the current landscape of the rift valley.