A cold island effect device comprises single reflecting device or a plurality of reflecting devices, wherein the reflecting device(s) is(are) arranged above the ground, water surfaces or buildings to form a space with shelter. Said reflecting device includes brackets (4) and reflecting planes thereon. The reflecting planes are parallel to or oblique to a horizontal plane. The total area of the reflecting planes of the single reflecting device or a plurality of reflecting devices is not less than 20 square meters.
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