| Supported by National Natural Science Foundation of China under grant NO.60571030, the methods about measuring the electric-field intensity in near field are mainly researched in this paper. Firstly, the electromagnetic radiation characteristics of Power Line Communication (PLC) Networks are analyzed in theory and the measurement methods on electromagnetic radiation from PLC Networks are researched. Secondly, the measurement system based on spherical probe is studied. The feasibility of the measurement of electric-field intensity in near field used the measurement system is analyzed in theory, then the measurement system is detected through a lot of tests and the approximate measuring range of electric-field intensity in 1~30MHz bandwidth is achieved. Thirdly, the methods of increase the sensitivity of the measurement system are studied and the voltage follower based on operational amplifier is designed. At last measuring the electric-field intensity in near field with the measurement system is carried out.
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