Visual illusion seems as one of the reflections of visual mechanisms and it could be an effctive cue for getting better understanding on human visual mechanism. It is expected that the psychophysical studies by using visual illusion can make bridge between psychological researches and physiological researches. Several years ago. the author found new types of visual illusion with binocular viewing, They have been used for investigating the mechanism of human visual system. then several interesting phenomena. have been found. In this paper, the author will introduces newly found 3-D illusions with binocular viewing. Then. he will invesligetes the possibilities of these Illusions to affer one clew for revealing the human visual mechanism.