The spherical alumina carrier with small particle size (1.5mm~1.7mm) is prepared using high-standard raw materials and oil-drop method at one time. This product displays the advantages of uniform particle size, smooth surface, large pore volume, concentrated pore size, high mechanical strength and low abrasion index. It is suitable for use as the catalyst support in the moving bed, and can also be customized for specific catalytic reactions. As of now many qualified products have been prepared for different customers at home and abroad.