Abstract: To the early 1980's，some of Chinese scholars presented, based on geophysical data and by means of the system of“channel，valley and basin" from Japan，that the north half of Tianshan Mountain should be merged along the Boloholo—Achicakuduk deep fractures into Junggar—Kazakstan plate (oceanic crust), the south half of it into Tarim plate(contlnental crust), and Tianshan Mountain was not an independent geologic—tectonic clement ay longer. But the author thinks that Tianshan Mountain is still an important element, because of the fact that the east half of Ludaohaishan Mountain of Japan had not under—thrusted downward，in contrast，it is 1 600 meters higher than the west half of it，indicating that the system of“channel，valley and basin”is out of accordance with situation of Japan Archipelago，and Boloholo deep fracture was not game as Achicakuduk in Bouguer anomaly. In addition，Tianshan Mountain's geochronology is linked with that of Qinlian Mountain，Qinling Mountain and Dabieshan Mountain as wel as Lu-Hu regions. So, a great paleo—latitudinal structural zone should be formed by them with similar paleo—latitude and echelon patterns. It is concluded that Tianshan Mountain can be classified as middle Tianshan volcanic rock zone, south and north Tianshan ultrabasic rock—paleofault block folded zone and Tianshan external margin folded zone.

Key words: Tianshan Mountain, Geologic structure, Folded zone, Paleo-latitudinal structural zone, Volcanic rock