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Using spectrometer, low noise frequency converter as well as the power splitters for antenna system G/T value test, using the carrier to noise ratio comparison method of antenna system G/T value measurement, this paper introduces the principle and calculation formula, the method through the G/T value standard horn, the fusion of the antenna under test and standard gain horn target satellite beacon respectively, their respective normalized carrier to noise ratio can be obtained, get the final antenna G/T value. The G/T value of the antenna is obtained through specific test experiments, which proves that the method is indeed effective.