Under the collision between India Plate and Eurasia Plate, the deep substance began to adjust and move. Based on the stratificational velocity structure, especially the special layers beneath the Qinghai-Tibetan Plateau and its adjacent areas, the research results suggest that the crust beneath the Qinghai-Tibetan Plateau is very thick, but the lithosphere of it is thin; There exists a low velocity layer with Vp of (5.7±0.1) km/s and thickness of (8±2) km at depth of (20±5) km; The top boundary of the asthenosphere lies at depth of (110±10) km; Under the force system towards N-NNE from the collision between India Plate and Eurasia Plate, the high velocity substance low crust and covering strata of upper mantle move laterally with the low velocity layer in crust as the first and the asthenosphere as the second slip interface.