The clays were modified by using an antioxidant, metal passivating agent and polymeric coating agent,a nd the corresponding clay-rubber masterbatch was prepared from the modified clay. The properties and structure of the masterbatch after thermo-oxidative aging were studied. The results indicated that the actions of the antioxidant, polymeric coating agent and metal passivating agent, the thermo-oxidative ageing resistance of the masterbatch was significantly improved. Properties such as tensile strength, elongation at break and tear strength of the masterbatch could be increased from -61.4;, -40.9;and -57;to -11.1;, -9.7;and -8.9;, respectively. The SEM ultrastructure of the cross section of the modified clay-rubber masterbatch after aging showed that the boundary surface between layers of section smooth, which meant that the structure of the rubber was preserved satisfactorily.