There developed the salt-underlying beds,the Cenozoic salt(or gypsum)beds and the salt-overlying beds in the Kuqa Depression, Tarim Basin. Based on the difference of contain gas for typical structures in the depression,this paper analyzed the geologic conditions of fault transporting natural gas effectively,and thought that the full and effective gas source,the faults of linking source rock and trap but not through regional cap rock and entire trap were significant conditions for natural gas migration and accumulation through fault. So,the salt-underlying faults which did not cut through the regional cap rock were effective hydrocarbon migration pathways,and this viewpoint was verified by our physical simulation. Based on analyses on the sealing degrees,volumes and physical properties of the sand bodies related to the effective migration pathway of fracture,it was found that the dominant migration pathways were obviously different for natural gas migrating along the pathways to flow into the reservoirs in both sides of the fault. In situation of the fracture effective migration pathway developing,the fluid bodies inside the fault zone were always flowing to the reservoirs which had relatively poor sealing,larger volume and better physical properties.