Abstract: To refine the detective effects of whole space transient electromagnetic method, the experiments had been conducted aimed at fully mechanized coal mining machine, scraper conveyor and bolt-mesh-support. The characteristics of the whole space transient transient electromagnetic responses of these typical underground interferences were classificated based on the electric potential - time curves and visual resistance rate - depth curves. Furthermore, the measures to weaken interferences had been sumarized and concluded. The results showed that: (1) the interference of large iron equipments will be significantly weakened when the distance to detecting coil beyond 4m; (2) for the iron that is difficult to move, the response is sensitive to the distance and when the scraper conveyor located outside the coil’s projection area on floor or the distance between bolt-mesh-support and coil is more than 0.6m, the interference can be significantly reduced. Finally, field application workd well based on the research results, the research results have well prospects for popularization.