According to studying the discharge characteristics of discrete water droplets on the silicone rubber surface in non-uniform electric field, the results show that: in he needle-plate electric field, it will remarkable affects the surface flashover voltage of silicone rubber when the number of discrete water droplets reach a certain quantity, when a few discrete water droplets on the surface of silicone rubber, the surface flashover voltage keep same; The volume of discrete water droplets affects the flashover voltage a little; the flashover voltage decreases with the increase of the conductivity of the discrete water droplets on the surface of silicone rubber .