From the Middle Proterozoic to Early Paleozoic, the Tarim plate and the Qangtang-Yangtze plate were most probably disintegrated. From the Late Paleozoic to Triassic the western Kunlun might evolve into an active continental margin, resulting in the formation of the Kongur-Sanju and Qarlang-Karlong trench-arc-basin systems from north to south. Meanwhile, the southwestern part of Tarim developed probably into a cratonic downwarped basin. Because of the possible collision between the Tarim plate and Qangtang-Yangtze plate at the end of the Triassic and "accordion" -type motion of Tethys since the Mesozoic and Cenozoic, the western Kunlun was severly deformed, metamorphosed and displaced.