Provided are a glasses-free three-dimensional (3D) display device, a setting method of the same, and a using method of the same. The glasses-free 3D display device includes: a display device including a flat panel display; and a 3D viewing cover detachably disposed on the flat panel display, the 3D viewing cover configured to allow images displayed on the flat panel display to be viewed in three dimensions, wherein the display device includes a cover setting program executable by the display device to set setting parameters of the 3D viewing cover.