The initiation characteristics of silicone rubber for cable accessories was studied under different mechanical stress(0~0.5 MPa), and their stress-strain curves were measured and simulated with Mooney-Rivlin model. The results show that with the increase of applied stress, the initiation voltage of electrical tree decreases monotonically, the probability of single-branch-like trees increases, while the probability of intensive trees(pine-like and bush-like trees) decreases. When the pressure is greater than...