In order to solve the problem that many hidden geological structures (collapsed columns, faults, etc.) inside the mining face of No. 2 and No. 3 coal in Laomupo Mine affected the safe recovery of working face, the internal radio wave tunnel perspective technology was used by the its sensitivity to inner collapsed columns, fault and other structures, through preliminary design, the field data acquisition and indoor data processing analysis process stage, the judge of internal collapsed column, fault location and scope were made. The pertinent measures were carried out, which solved the concealed geological structure caused in the late process of mining face, with good economic and technical effect.