The last decade shows, that elastomer composite, filled with conductive nanoparticles, have supreme pressure sensing properties [1] and could compete with other pressure sensing materials. Our study shows that given material possess both: piezoresistive and hyper-elastic properties. The main idea of this work is to investigate electrical properties of the composite, depending on filler concentration and determine the conditions corresponding to the best piezorezistive effect. The percolation threshold (Fig.1) and its critical parameters have been determined at first, as it is crucial for further investigation. This has been done according to W.Bauhofer [2] and basic theory of statistic percolation. The piezoresistivity of the composite was determined at different filler concentrations. To evaluate microstructural changes of the composite under strain, we obtained time dependences of the resitivity under different loading conditions.