Abstract: In this paper,the flame retardant performance of 110 kV high-voltage cables with different flame retardant systems of polyethylene outer sheath, asphalt coating amount, cable specifications and flame retardant semi-conductive layer are studied.Through the comparative analysis of the test the results show that the carbonization height of the bundle combustion test,the flame retardant performance of the flame retardant polyethylene sheathed high-voltage cable is closely related to the flame retardant system of the outer sheath material,the amount of asphalt coating,the cable specification,and the flame retardant performance of the semi-conductive layer.