Abstract: Abstract：In order to evaluate the home-made intrinsic safety type mine transient electromagnetic instrument YCS40 ( A ) and its stability of the anomalous body resolution, the authors made a comparative study of the performance between this instrument and the frequently-used imported instrument of TERRATEM. In the experiment, the two instruments used their respective conventional device to conduct experimental contrast of single background values, the anomalous body resolution experiment contrast and the anti-jamming simulation experiment. And under the condition of the same EMF - decay time (V-T ) coordinates, the authors investigated their performance indices such as off time, induction electromotive force amplitude, and attenuation rate of smooth degree and period signal anti-interference degree. The downhole practical engineering measured profile survey contrast shows the home-made YCS40 ( A ) mine transient electromagnetic instrument has the advantages of good stability, strong anti-interference capability, fairly high resolution capability for anomaly body, but has the shortcomings of insufficient detection window, short induction time and insufficient resolution when the depth of the underground anomaly exceeds 120 m.