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The fabrication studies of a closely packed monolayer polystyrene naonospheres arrays were performed on the p-GaN surface of a thin GaN-based light-emitting diodes.Based on a self-assembly of latex particles on water surface,it was possible to prepare large arrays.Scanning electron microscope shows that well-ordered two dimensional arrays from hexagonally packed polystyrene nanospheres have been obtained.An analysis of the mechanism of two-dimensional array formation is also presented.