WO _x /SBA?15 catalysts with different loading amounts were prepared by wet impregnation method, and the effect of WO _x dispersion on the olefin disproportionation reaction was discussed.The results show that the loading amount affects the dispersion of WO _x on the carrier surface, as well as the catalytic activity.The best catalytic performance of WO _x /SBA?15 can be achieved with 10% loading amount of WO _x .The higher loading amount of WO _x could induce aggregation of WO _x on the SBA?15 surface, and then covering the active sites.The weaving properties of the samples were characterized by physical adsorption,XRD,SEM,and the acidity and acid amount of the samples were characterized by pyridine IR and chemisorption. Reaction evaluation shows that the sample with 10% loading amount of WO _x exhibits the best catalytic activity.The propylene yield of the 10% WO _x /SBA?15 catalyst is up to 50% and the propylene selectivity is nearly 90%.