Abstract: In order to validate the cat eye effect and its application feasibility of ordinary optical lens, an experiment was operated by 532 nm laser irradiating on an ordinary optical zoom lens whose focus ranged from 12 mm to 72 mm. The absolute reflectivity of cat eye effect was tested, and variable rules of the reflectivity were obtained when the focus, F number and incident angle were adjusted. When the reflected light returned from the original way and disturbed the incident ray, the reflectivity could not be tested easily and it was solved by using the method of double-ray testing. The results reveal that the maximal absolute reflectivity can be as high as 35.87%, and the reflectivity is in direct proportion to focus, inverse proportion to F number and incident angle; the geometrical diverge