Abstract: Step thermal,and A.F.demagnetizations have been done for 518 samples (47 sites) from Sishichang section across the Aksu area,in the Tarim Basin.The mean paleomagnetic pole positions calculated upon the characteristic magnetization are φ=10.5°S,λ=151.2°E for the Late Devonian;φ=52.2°N,λ=179.5°E for the Late Carboniferous;φ= 56.5°N,λ=190.1°E for the Early Permian.The results show that the Tarim block was one of the parts of the Laurasia but not of the Gondwana during Late Paleozoic,and that from the Late Carboniferous to Early Permian the Tarim block had collided with the Kazakhstan block,Siberian block and Russian block,and no displacements large have occurred between these blocks since the Mesozoic.However,the pole position in the Permian for the Tarim block differs obviously from that for Sino-Korea block (φ= 44°N,λ= 358°E,after M.W.McElhinny et al.).The differential paleo-latitude was about 10?between the Tarim and Sino-Korea block in the Permian.Their orientations were also different from each other.The paleomagnetic result is contrary to the geologically conventional idea that the-two blocks in question appeared as a whole in the Late Paleozoic.