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A novel way to design arbitrarily shaped retro-reflectors by optics surface transformation is proposed.The entire design process consists of filling an optic-null medium between the input and output surfaces of the retroreflector,on which the points have 180 deg reverse corresponding relations.The retro-reflector can be designed to be very thin (a planar structure) with high efficiency.The effective working angles of our retro-reflector are very large (from-80 deg to +80 deg),which can,in principle,be further extended.Layered metal plates and zero refractive index materials are designed to realize the proposed retro-reflector for a TM polarized beam.