Abstract: The detailed interpretation of 3D seismic data of Yaha structural belt shows that there exist obvious differences of fault activity between the Cambrian and the Meso-Cenozoic. Its plane distribution mainly occurs in four directions: near EW, NWW, SN and NE, of which near EW Yaha fault is dominant fault and has undergone such tectonism stages as thrust nappe, negative inversion and left-lateral strike-slip process from compresso-shear to transtension, and along its strike developed a series of faulted anticlines. These fault activities control the distribution of Cambrian buried hill, the development of favorable reservoirs and the migration of oil and gas. Also, they are pathways for hydrocarbon migration and accumulation in Paleogene in this area.

Key words: Tarim basin, Cambrian, buried hill, fault