Abstract: When installing cable accessories, silicone grease is usually applied at the interface between silicone rubber insulation of cable accessories and XLPE insulation of cable body. The mechanical properties of silicone rubber will be affected after silicone rubber absorbs silicone grease. At present, the mechanics of silicone rubber after absorbing silicone grease in many cases is not adequately researched. In this paper, the influence of absorbing silicone grease on its basic mechanical properties was studied, the influences of expansion degree, temperature, and absorptivity on the stress relaxation, creep and permanent deformation rate of silicone rubber after absorbing silicone grease were systematically studied, and the influence of different coating conditions on crack development was studied. The results show that the elastic modulus, tensile strength, and elongation at break of silicone rubber decrease after absorbing silicone grease; there is no obvious rule between the stress relaxation and expansion degree and temperature, but the permanent deformation rate increases with the increase of expansion degree; the greater the content of silicone rubber absorbed silicone grease is, the more serious the stress relaxation, creep and permanent deformation rate are.When the silicone grease is only applied at the crack, the cracks develop most rapidly.