N, N-diamino-N-octadecyl-N-trimethyl ammonium chloride were used as an intercalation agent to treat Na+-montmorillonite and for forming a kind of OMMT. OMMT was analyzed by fourier transform infrared spectroscopy (FTIR) and wide angle X-ray diffraction (XRD). Novel polybutadiene styrene rubber (SBR)/organic montmorillonite (OMMT) composites were prepared by SBR and OMMT. Properties such as cure characteristic, tensile strength, elongation at break, abrasion loss and thermal properties were researched and compared. Results showed that SBR/OMMT-10% composite had the best tensile properties.