Abstract: To investigate effects of the cross-linking agent and carbon black (CB) content on characteristics of semi-conductive shielding materials for high-voltage cables, a blend was prepared by incorporating conductive CB as filler, ethylene-butyl acrylate (EBA) copolymer as matrix and BIBP as cross-linking agent via melt blending and crosslinking. Influences of BIBP and CB content on thermal elongation, volume resistivity, mechanical properties and rheological performance of semi-conductive shielding materials were studied. Results showed that when the addition amount of EBA and CB were 70 and 30, as BIBP content increased, thermal elongation and permanent deformation rate of the semi-conductive shielding material decreased, volume resistivity increased, tensile strength gradually improved, elongation at break showed a trend of initially increasing and then decreasing, and melt flow index increased. When the addition amount of BIBP was 1.0, overall performance was optimal. When the addition amount of EBA and BIBP were 70 and 1.0, as CB content increased, volume resistivity of the semi-conductive shielding material gradually decreased. When the addition amount of CB increased to 25, reaching its percolation threshold, volume resistivity of the semi-conductive shielding material dropped sharply. When the addition amount of CB was 35, volume resistivity of the semi-conductive shielding material was 4.3 Ω·cm and 16.2 Ω·cm at 25 ℃ and 90 ℃, respectively. Simultaneously, the positive temperature coefficient (PTC) was 0.82, indicating the best suppression effect on PTC. As the CB content increased, tensile strength remained relatively stable, while elongation at break gradually decreased. When the addition amounts of EBA and BIBP were 70 and 1.0 respectively, and CB content was in the range of 20-35, mechanical properties all met national standard requirements.