Abstract：Research purposes: The alternate current electrified railway not only causes the interference to the railway communication system，but also generates induction voltage between metal and conductor，or between metal conductor and the earth nearby the electrified railway，which would interfere the normal work of the communication equipments. So it is necessary to do the researches on the interferences on communication by electrified railway，and electromagnetic protection of the communication system in order to provide certain theoretic basis for the real works to guarantee the running safety of communication system.
Research methods: In this paper, the method of analyzing the interferences on the underground communication system by electrified railway was established by adopting the equation of electromagnetic field to activate coupling of underground transmission line and its solution.
Research results: The following mechanism，limitation value，formula and data are obtained and calculated: the mechanism for the interference on railway communication by electrified railway，the limitation value of interfering railway communication by electrified railway，formulas for calculating interference of magnet coupling and interference of earth current，and the data related to causing isolated distance exceeding limitation value.
Research conclusions: The interference on the cable and fiber cable in the railway communication system by electrified railway can be controlled effectively by adopting the relevant protection measures for the cable and fiber cable，therefore，the purpose of electromagnetic protection can be achieved.
王邠. 交流电气化铁道通信电磁防护的研究[J]. 铁道工程学报, 2007, 24(3): 60-64.
WANG Bin. Research on Electromagnetic Protection of Communication on Electrified Railway. 铁道工程学报, 2007, 24(3): 60-64.
2007, Vol. 24 
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