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.

“盆地”构造发育模式为：从世到白垩纪末期发育山间“盆地”开始、发展到早第三纪断陷湖盆发育、再演化为第三纪及第四纪地陷发育阶段。