A new protocol for the photoinduced addition reaction of sulfides with benzophenones has been extablished, affording the αfunctionalized products. The effects of UV wavelength, temperature, concentration of reactants, concentration of Lewis acid catalyst and other factors on the isolated product yield have been investigated. The optimum condition is: UV light wavelength of 313 nm, room temperature, 0.02 mmol of 4,4dimethoxybenzophenone, 0.002 mmol of the catalyst of AlCl3. Under optimum conditions, the isolated yield of the desired product (4methoxyphenyl) (2tetrahydrothienyl) methanol is 57%. Based on the experiment results and corresponding literature reports in this field, a possible mechanism is discussed.