Abstract: Carbon fiber and glass fiber (CG fibers) reinforced rubber composite was prepared by using mill mixing
in solid state, and it screeping curve and stress relaxing curve were measured using Gleeble 3500 thermal simulator,and the viscoelasticity was also studied. The results indicate that , when the volume fraction of CG mixture fibers was less than 15 %, the rubber creep resistance and stress relaxing resistance were improved; when the volume fraction of CG mixed fibers was more than 15 %, the rubber creep resistance and stress relaxing resistance began to decrease. The relationship of creep and stress relaxation of rubber composites is reciprocal in value.