The mafic intermediate Permian dykes widely spread in parallel around the Karamay region, northwestern Junggar, are considered as a typical product of late collision tension. Based on outcrop features and microscope observation, including the dyke branches, oriental xenolith, mineral lineation and oriental porphyrotope, this study concludes that NWW SEE dykes emplaced from west to east. The measurement of the anisotropy of magnetic susceptibility(AMS), the dominant orientations of the maximum magnetic susceptibility and analysis of susceptibility characteristics also indicate that the mafic dyke swarm emplaced from NWW to SEE. Combined with the space time distribution characteristics of Dalabute fault, the results shows that the magma transported through the deep fault system of Dalabute to the subsurface and emplaced into the pre exist fractures system to form dyke swarms.