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Stringing haulage motors were main underground conveyance equipments, but they were the strong electromagnetic interference sources. To resolve the problem of monitor system false alarm and mobile communication interruption, the interference generation mechanism and distribution characteristic were analyzed. The means of conducted interference circuit analysis and stray current quantitative analysis were adopted. The radiated interference of the stringing haulage motor was measured with Protek3201 field-intensity meter at the second mine of Pingdingshan coal Co. Ltd. The conducted interference, stray current and radiated interference were the main factors of gas monitor and mobile communication malfunction. The anti-interference measures were taken, which included the power supply isolation, equipotential earth and shield to radiated interference. Results indicate monitor system false alarm and mobile communication interruption have been eliminated completely. It is concluded that the electromagnetic compatibility of underground gas monitor and mobile communication has been enhanced evidently with these anti- interference measures.