The basin tectonic model: it is intermont basin during late Jurassic to early Cretaceous, developed into faulted-lacustrine basin in Eogene, and evolved into depression in Neogene and Quaternary.

“盆”发育模式为：从晚侏罗世到白垩末发育的山间“盆”开始、发展到早第三湖盆的发育、再演化为晚第三及第四发育阶段。