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The integrated test system on aircraft is used to comprehensive examinations about any function coordination and interfaces compatibility. If the groundings of the equipments are false, equipments on the ground and products on the aircraft are disturbed, even a hazard voltage imports the aircraft. The functions of grounding was introduced. Combining the functions and components of the integrated test system, the grounding principles and methods of the test equipments were analyzed. The guaranteed safety measures of grounding were proposed. This paper is a useful reference for the manufactures of the aircraft products.