Abstract: The spatial-temporal framework of the arc-basin systems in the western part of the Bangong Lake-Nujiang suture zone may be divided, from north to south on the basis of the results of the 1:250 000 geological mapping, into the Wufengjian-Larelaxin Late Jurassic-Early Cretaceous epicontinental volcanic-magmatic arc zone, northern and southern subzones of the Bangong Lake ophiolitic mélange zone, and Nganglong Kangri-Baingoin Cretaceous-Eocene magmatic arc zone. The Meso-Tethyan Ocean once went through the Triassic-Early Jurassic spreading, Middle-Late Jurassic northward and southward bidirectional subduction, Late Triassic-Early Cretaceous residual ocean (sea)basin and Early-Late Cretaceous continent-arc (continent)collision.