The Zanda basin, bounded by the Ayila Ri’gyu and Boling faults in the northeast and southwest respectively, is located in the southwest of the Tibetan plateau. There developed a suite of Pliocene to Pleistocene strata, which can be, from bottom to top, divided into four members: A, B, C and D. The first three members, representing three large tectonic cyclothems, have similar sedimentary features. Their lower parts are composed of conglomerates deposited in braided river, the sandstones of middle parts deposited in meandering river, and the upper parts being lacustrine mudstones with minor thin sandstones. The member D is a suite of lacustrine mudstone. Cyclothemic characteristics, penecontemporaneous and subsequent deformation reflect that this area was compressed, from Pliocene, by the regional stress, and uplifted strongly. What mentioned above provided strong support for the Tibetan uplifting in the recent several million years.