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[en] In this paper, the carbon-fiber double-layer spacer fabric (CFDSF) was firstly introduced into epoxy resin (EP) for fabrication of CFDSF/EP composite materials. It is indicated that the introduction of CFDSF can significantly improve the mechanical properties of EP. Meanwhile, the influence of the content of modified carbon black (CB) on the mechanical and electrical properties of CB/CFDSF/EP composite materials was investigated. The results showed that the flexural strength and impact strength of the CB/CFDSF/EP composite materials were improved as the modified CB content increased to 3%. The bending and impact strengths were found to be 123.8 MPa and 15.88 kJ/m2, respectively, owing to a fracture mechanism transition induced via the addition of modified CB. As the modified CB content increased from 6% to 15%, the bending and impact strengths exhibited a decreasing trend and typical brittle features were evident in the composite. Further, the volume resistance of the CB/CFDSF/EP composite materials also presented a decreasing trend.