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The crust of rock and ore bodies in the Earth's magnetic field, since they are formed from it by its magnetization with varying degrees of magnetism, its magnetic anomaly is caused by differences in the surface [1]. Local aeromagnetic anomalies, generally considered likely to the three geological factors, namely related to the basement uplift or bedrock block; related to the distribution of igneous rocks; and related to the sedimentary cover of the magnetic layer. With the surface weathered, the magnetic susceptibility about rock or dikes of granite porphyry will within 100×10-5SI; with the surface fresh, the magnetic susceptibility about rock or dikes of granite porphyry will more than 1000×10-5SI. High magnetic rocks are mainly magmatic rock and wall rock alteration (skarn, hornfels, etc.), low magnetic rocks are mainly metamorphic sedimentary rocks, rock magnetic differences are significant, this difference in fresh lithologic section more prominent. [ABSTRACT FROM AUTHOR]