| Magnetic prospecting was widely used to search for magnetic and non-metallic mineral deposits of various metals, geological mapping, prospecting regional geological structure, coal oil and gas structures and construction and so on. Magnetic prospecting data processing and inversion, and comprehensive application was conducted.First of all, the formula of pretreatment magnetic anomaly was given, which was included the diurnal correction and a high degree of correction, etc. , and some typical of the geological model of the magnetic field expression were given, which were the forward models. In magnetic prospecting data processing and conversion, it was divided into analytical continuation and weight conversion. Upward continuation was that the integral interpolation method was used to solve upward continuation coefficients. And downward continuation was that constructing a fourth Lagrange polynomial was used to solve downward continuation coefficients. In the analysis of weight conversion, method of integral mean value theorem was used to solve the conversion between the vertical component Za and horizontal component Ha in the same plane. The specific implementation steps of analytical continuation and conversion components were obtained, and Mat lab was used to realize. Inversion of the magnetic exploration data, the damped least square inversion method which was one of the optimization methods was used to achieve. Concrete steps had been achieved, and the Mask module was called. In the end, comprehensive application was conducted. According to a magnetic iron-nickel ore and an iron ore in Inner Mongolia, data obtained by magnetic prospecting was used to the diurnal variation correction, and then the magnetic anomaly upward continuation of the analytic continuation, in order to determine the scope of the ore body. Inversion was used to determine the physical characteristics of ore body, and drilling, trenching and other information were applied to verify the conclusion .
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