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A sun-screening agent isooctyl p-methoxy cinnamate was prepared by reaction of p-methoxyl benzaldehyde with isooctyl acetate using titanium tetrachloride as catalyst. The optimum conditions are as follows: molar ratio of p-methoxyl benzaldehyde to isooctyl acetate and titanium tetrachloride is 1: 1.1: 0.5; reaction temperature is 30℃; and reaction time is 6 h. The yield of isooctyl p-methoxy cinnamate can reach 98％. The method of the synthesis of isooctyl p-methoxy cinnamate is efficient and economical.