Organic nanoclay(NC) with highly geometry anisotropic was introduced into natural rubber(NR) by replacing the same amount of carbon black(CB) to prepare NR/CB/NC nano-composites.The static mechanical properties,dynamic mechanical properties,thermal stability,aging resistance and tensile fatigue performance of the composites with different NC/CB ratios were investigated.The results show that NC/CB hybrid filler could not only improve the curing efficiency and the static mechanical properties of the composites,but also enhance the thermal stability and aging resistance as well as the tensile fatigue performance of the composite.Compared with CB25 sample,the tensile strength and the tensile fatigue of the composite with 2phr NC increase by 72% and by 31%,respectively.