The reflective material is uses optics refraction direction detection return principle with the glass micro bead or the microprism material to produce, does not have the radioactivity and the poisonous side effect to the human body. With retro-reflecting material manufacture caution product label, clothing, compared to other non-retro-reflecting material under light illumination striking several hundred times, to guaranteed that the transportation, the equipment, the personal safety have the tangible effect, to the senior citizen, the child, the disabled person travels the security to have the special protective function especially.