The invention designs an ester compound having the general formula (I), which is used as an internal electron donor of a titaniferous catalyst component and applied to the titaniferous catalyst component for olefin polymerization. A 1-subsituted benzoyloxy-3-alkoxypropane compound using the general formula (I) is used as the titaniferous catalyst component synthesized by the internal electron donor. When a catalyst made from the titaniferous catalyst component is used for olefin polymerization, especially propylene polymerization, the catalyst has high catalytic activity; an obtained polymer has high isotacticity and wide molecular weight distribution.