Abstract: Cenozoic volcanic rocks in the Kunlun Mts. district between the Northern Tibet and Southern Xinjiang have been studied in geology, petrology, major and trace element geochemistry. They are divided into two belts: one is an alkalicvolcanic rock belt erupted mostly in Late Tertiary (South belt) and ether is a calcalkalic volcanic rock belt erupted mostly in Quaternary(North belt). Origin of volcanics in this area could be explained by subduction of the Talim continental lithosphere southwards beneath the Tibetan Plateau. and it is suggested that the intracontinental subduction not only can interpret recent uplift of some mountains in western China, but also is suitable for all collision zones which have unusually thick crust and therefore this mechanism is universally applicable. The Kunlun type and Himalayan type of the intracontinental subduction are proposed on the basis of different geological characteristics.