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The environmentally friendly gas C₄F₇N has been considered a potential replacement gas for SF₆ due to its excellent insulation. At present, research on C₄F₇N and its mixture mainly focuses on its insulation performance, but few people study its surface discharge mechanism and variation law. In order to study the surface discharge characteristics of the C₄F₇N/CO₂ mixture, a fluid model of surface discharge was established and simulated by COMSOL, which was used to study the mechanism of streamers during surface discharge, fit the expression of the maximum photon flux, analyze the influence of voltage and the dielectric constant of the insulator on discharge, and compare the surface discharge of C₄F₇N/CO₂ with that of SF₆, providing the theoretical basis for the optical detection and reliable diagnosis of partial discharge. The results show that, under the same discharge conditions, the optical phenomenon of C₄F₇N/CO₂ discharge along the surface is more obvious than that of SF₆, and as the applied voltage or the dielectric constant of the insulator increases, the streamer develops more quickly, the electric field becomes stronger, and the photon flux increases.