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The insulation materials used in the high field fusion magnets should be characterized by excellent mechanical properties, high electrical breakdown strength, good thermal conductivity and high radiation resistivity. Previous investigations by the authors showed that cyanate ester/epoxy (CE/EP) insulation material, a candidate insulation material for the fusion magnet, can maintain good mechanical performance at cryogenic temperature after 10 MGy irradiation and has a much longer pot life than traditional epoxy insulation material. In order to quantify the electrical properties of the CE/EP insulation material at low temperature, a cryogenic electrical property testing system cooled by a G-M cryocooler was developed in this study. The cryogenic electrical breakdown strength of the CE/EP insulation material was measured before and after irradiation.