Abstract: With the wide application of the ship integrated power system, the complexity of the functions of the ship integrated power system has brought serious electromagnetic compatibility problems, in which the high-power variable frequency cables produce particularly obvious radiation interference to adjacent instruments and control systems.Different test methods of cable electromagnetic shielding effectiveness were studied and analyzed for comparison.The short-short triaxial method was used to test the electromagnetic shielding effectiveness of typical marine inverter cable samples with six different shielding structures, and the results showed that different shielding structures make a greater impact on the shielding performance of marine inverter cables when the materials and specifications of the cables are basically the same.