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With the development and application of the high voltage electricity transmitting technology,the harm of corona discharge to the safe and stable operation of the high-pressure and ultra high voltage(UHV)transmission lines from transmit line is more serious.So it is necessary to research the radiation law of the corona discharge.In this paper,the radiation law of corona discharge was researched by theoretic analyzing and laboratory simulation studying.The correlated conclusion was gotten:the waveform of corona discharge was attenuated oscillation mode;as the charging voltage increases,the signal radiation field increases;the signal amplitude that the antenna received was attenuated with the distance.