An optical fiber layout of light decorative object, in that the layout is for simulating illuminating accumulated snow in a decorative object, includes a house, a separate roof covering a top portion of the house, and an optical fiber strip formed by a plurality of optical fiber threads and clamped between the house and the roof. The invention is characterized that, a light curtain is exposed at a bent end portion of the optical fiber strip for simulating glittering effects of an icicle screen of the decorative object.