Abstract: Aiming at the problem of low accuracy of fault detection by conventional geophysical methods under the condition of large burial depth, taking a mine in Inner Mongolia as an example，a methods of controlled-source audiomagnetotellurics (CSAMT) was used for exploration.. Through the CSAMT suitability analysis, field optimization test, data processing and inversion calculation, the integrated resistivity of the stratum in the exploration area is obtained and compared with the TEM detection results. The results show that the CSAMT has higher resolution and stronger electromagnetic field signal, which has obvious applicability to deep buried layer detection. The reasonable test parameters of CSAMT are determined, which are 5120~4Hz in frequency band, 32 in frequency points and 30 minutes in superposition time. The apparent resistivity of CSAMT and TEM field applications is compared and analyzed, and CSAMT can better reflect the change of coal seam dip angle and local water enrichment, and improve the degree of refinement of detection. The research results can provide technical means and application reference for the deep buried concealed structure or the enrichment fine detection of the coal seam roof.