Abstract: Aimed at the transient electromagnetic interference generated by the high-voltage and high-power motor equipment in underground coal mines,the mech anism of transient electromagnetic radiation caused by the start-stop process of the industrial frequency AC motor equipment is analyzed.Combined with the characteris tics of mechanical and electrical equipment in underground coal mines,the radiation sources of transient electromagnetic radiation are studied. The measurement requir ements of electromagnetic radiation are also analyzed.Moreover,the radiated electromagnetic disturbance produced by switching on or off the water pump motor has be en measured in underground coal mines.The results show that the transient electromagnetic radiation spectrum is wide,and is mainly concentrated within the100 MHz; The radiated electric field intensity reaches the maximum in the range from 1 MHz to10 MHz; There are still some obvious radiated electromagnetic noise protrusions a bove 100 MHz,but their intensity is relatively weaker.The research results can provide reference and basis for further research and treatment of transient electromagneti C radiation interference.