Abstract: Nickel-silicone rubber polymer composites were prepared using silicone rubber and nickel powder at a ratio of 1∶2. The effect of pressure and the dielectric properties of the composite samples at room temperature were  measured. The results show that the resistance of samples under modest compression can fall f rom about 1×10¹²Ω to <10Ω，a change of 11 orders of magnitude. A resistance creep has also been observed：the resistance of samples under constant st ress decreases with time. The permit tivity and dielectric loss of the composite at room temperature decrease with increasing frequency but increase with application of uniaxial stress. This is because the special microstructure of a capacitor network formed by the metallic filler particles and the insulating polymer materials of the composite. Under uniaxial pressure，the distance between metallic particles decreases，leading to an increase in capacitance and conductivity , which in turn results in an increase in dielectric loss.