Abstract: Taking vulcanized silicone rubber as matrix, the magnetic-sensitive elastomer(MSE) samples with various compositions of micron(particle size of 5-8 μm) and submicron(particle size of 200 nm) soft magnetic particles were prepared under conditions with magnetic field and without magnetic field, and the magneto-conductance characteristics of MSE samples were studied by conductance device and magnetic field-dependent conductance test system. The mechanism of magnetoconductance was explored. The results show that the magnetoconductance of MSE filled with micron particles under preparation condition with magnetic field increased significantly with increasing particle doping content. With increasing doping content of submicron particles, under the condition of magnetic field preparation, the adsorption effect occurred between micron and submicron particles in MSE doped with micron and submicron particles, the increase values of zero-field conductance and magnetoconductance decreased greatly, and the magnetoconductance property became weak. The different size particle-doped MSE under preparation condition without magnetic field could not form an effective conductive channel, and the magnetoconductance characteristics were significantly lower than those of the same content particle-doped MSE under preparation condition with magnetic field.