Abstract: Semi-conductive shielding materials for high voltage cable are made of matrix resins, conductive carbon black and processing aids through melting blending technology. The processing aids play an important role in the quality of semi-conductive shielding materials. However, the effect of processing aids on the performance of semi-conductive shielding materials is rarely reported. Herein, conductive carbon black (CB)/ethylene-butyl acrylate copolymer (EBA) semi-conductive shielding material is prepared to investigate the effects of processing aids. Scanning electron microscope and optical microscope is used to observe the inner microstructure and surface finish of the CB/EBA materials. The electrical and mechanical properties of the CB/EBA materials are performed on a resistivity tester and an electronic universal testing machine. The semi-conductive shielding materials exhibited an electrical resistivity of 13.6/307.9Ω·cm at 23/90℃, a tensile strength of 18.5 MPa and an elongation at break of 241.5%, respectively, at 30% CB, 2.0% EBS and 1.0% cross-linking agent, respectively. No obvious protrusion point of larger than 50μm is observed on the surface of the samples, achieving the requirements of high-voltage cable in practical applications. The prepared semi-conductive shielding materials in this work show the same level with the foreign products, which is of significance in promoting the development of domestic high-voltage cable shielding materials.