早古生代早期，北祁连造山带发生强烈的挤压变形作用，形成加里东期的俯冲－增生杂岩、高压变质岩，并使造山带岩石圈地壳加厚缩短。志留纪末期，加厚的造山带岩石圈由于垮塌作用及根部的拆沉作用，使造山带从挤压造山机制转换为伸展造山机制，并进入后造山伸展作用阶段，增厚的岩石圈开始减薄，发生不同层次的伸展作用，同时伴随花岗岩及Ａｎ∈变质岩的穹隆以及泥盆纪磨拉石盆地上叠盆地（Ｃ－Ｔ）的形成。石炭纪末，北祁连造山带岩石圈地壳已基本减薄到正常厚度。而现今的北祁连造山带的缩短和抬升则为喜马拉雅期再造山作用的产物 Early Early Paleozoic, North Qilian orogenic belt occurred a strong extrusion deformation, the formation of the Caledonian subduction - accretionary complex, high-pressure metamorphic rocks, and the orogenic lithospheric crust thickening and shortening. At the end of Silurian, due to the collapsing effect and the delamination of the root, thickened orogeny lithosphere transformed the orogenic belt from an extrusion orogenic mechanism to an extensional orogeny and entered the post-orogenic extension stage where thickening lithosphere began Thinning and stretching at different levels, accompanied by the domes of granite and An ∈ metamorphic rocks and the formation of the Upper Devonian Basin (C-T) in the Devonian Molaspan Basin. At the end of the Carboniferous, the crust of the lithosphere in the North Qilian orogenic belt has been basically thinned to normal thickness. However, the shortening and uplift of the North Qilian orogen today are the products of the Himalayan rejuvenation