The processes of the collision between the Qiangtang and Lhasa blocks is a key factor to understanding the evolution history and geodynamics of the central Tibetan Plateau.The paleomagnetic study for the Qiangtang block is critical to understand these questions. A paleomagnetic study of the Late Triassic limestones from the Gaize area in the western portion of the Qiangtang block has been carried out and a remagnetization component has been obtained. The mean direction of the characteristic remanent component in geographic coordinates is Dg=349. 3°,Ig=40. 4°,κg=45. 4,α95=6. 5°, corresponding to a paleopole at 76. 4 °N, 311.1 °E with dp/dm=4. 7°/7. 9°. This pole coincides with the Early Cretaceous (ca. 110~100 Ma) paleomagnetic pole of the Qiangtang block, indicating the age of the remagnetization is 110~100 Ma. Our new results, combined with previous reliable Cretaceous paleomagnetic results from the Qiangtang and Lhasa blocks and synthesize stratigraphy, ophiolite and ocean island evidence, suggested that the final closure of western portion of the BangongNujiang Tethys Ocean may have occurred during 110~100 Ma. Furthermore, the late Early Cretaceous remagnetization of the Late Triassic limestones in the Gaize area was closely related with the Qiangtang- Lhasa collision.