In order to investigate the effect of crack on tensile property of conductive rubber films(CRFs) under uniaxial tension load condition, carbon fiber-filled silicon rubber films were fabricated by spraying process, and tensile properties including tensile strength, elongation at break and tearing energy were tested to evaluate the crack propagation resistance of CRFs with precracks in different shape, size and directions. Fractograph was conducted to analyze the effect of carbon fibers on crack propagation in CRFs. Results show that the tensile strength and elongation at break of precracked CRFs decrease approximately linearly with the increasing length of surface crack in mode I, while the tearing energy decreases by stages. Meanwhile, crack shape exhibits more important influence on the tensile properties than crack location does as well as that greater adverse influence on tensile properties of CRFs comes from centered cracks seems greater compared to that from surface crack. With the increase of angle between crack plane and stress in centered-crack mode I, tensile properties of precracked CRFs decrease till the lowest resistance appears when the crack plane is perpendicular to the stress. Secondary cracks appear in crack propagation, which become as obstacle to the crack propagation. Carbon fibers play the same hindrance role by means of reinforcing the CRFs as well as changing the propagation direction of the crack.