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With the widening of the frequency band of the electronic equipment in the equipment system, the power gradually increases and the sensitivity is increasing. All kinds of electromagnetic sensitive equipment are exposed to more and more complex electromagnetic environment. Especially in the broadband receiving system, there are some factors such as the band off of frequency equipment and the side lobe effect of the antenna, so that even the system with good frequency planning and antenna layout will have potential EMC problems. When multiple frequency equipment interferes with a broadband receiving system, because of the complexity of the electromagnetic environment and many factors, there is not a fast and effective method of rapid diagnosis and optimization from the point of view of the whole system. In this paper, by fitting the equivalent noise interference in the environment, and then the dominant noise interference source in the corresponding frequency band is restored, so that the fault location is more accurate and the optimization measures are more efficient.