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In order to monitor the electromagnetism environment of many regions simultaneously, the design principle of distributed EM monitoring system is analyzed, the hardware connection scheme of the monitoring system is established, and the way of using a LAN to GPIB controller, a HUB and a computer to control many instruments is adopted, and the soft is developed. The test results show that the system has the function of controlling multiple spectrum analyzers, can measure the parameters of electromagnetism spectrum, background noise, frequency band occupancy, have the function of saving, play backing and analyzing the measurement data, and have the function of state feedback and abnormal state prompting, so the system can meet the requirements of electromagnetic monitoring in many areas.