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Aerospace special test equipment is usually customized for a specific space product test requirements, its function is mainly used to test whether the technical indicators of the product are qualified or not. If the external interference of the equipment is too strong or the anti-interference ability is too poor,it will directly affect the test accuracy of the product, and when it is serious, it may also bring damage to the product under test, then the equipment contractor will bear serious economic losses, so electromagnetic compatibility design plays an important role in aerospace special test equipment. Based on the analysis of power supply characteristics and EMI analysis of aerospace professional test equipment, the concrete measures for the application of power interference suppression technology in aerospace professional test equipment are discussed from three aspects: filtering, shielding and grounding. These electromagnetic compatibility methods have been successfully applied to the embedded power supply and chassis structure of a test equipment, and have passed nine electromagnetic compatibility tests, such as CE102, RE102 and so on.