Located in the southern part of Central Asia, the West Tianshan organic belt lies at the juncture between the Kazakhstan- Junggar ancient plate and the Tarim ancient plate and is composed of Paleozoic epicontinental rock series, oceanic crust relicts and Precambrian microlandmass. Its structural evolution process is a miniature of the evolution of the Northern Xinjiang paleo-Asiatic Ocea. It experienced the formation of continental nucleus in Archean-early Proterozoic period, the evolution of Ancient Tianshan oceanic basin in late Proterozoic period, and the generation of a unified Xinjiang part of Gondwana in late Proterozoic period. In late Proterozoic period, Tianshan region, as a part of the paleo-Asiatic Ocean, began cracking; in Cambrian period this region entered the peak stage of expansion; in Ordovician-Carboniferous period, the ancient subduction zone was formed, and the ancient ocean basin was continually contracted; in Late Carboniferous period, the Tianshan ancient ocean basin was closed, with the formation of an unified continental crust; in Middle Cenozoic period, the region entered into the intracontinental evolution stage.