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With the development of superconducting technology, the electrical performance of insulating materials is drawing increasing concern. This paper is devoted to investigating resin materials and aims to test the resin requirements of impregnating procedures and design curing molds. First, the samples are prepared, and then the power-frequency breakdown, lighting surges, relative dielectric constant, and loss angle tangent of the impregnation resin are measured at room temperature and liquid nitrogen temperature. We also present the testing reference for cryogenic and high-voltage insulating materials of superconducting power devices. Keywords: Liquid nitrogen temperature, Impregnation resin, Electrical performance