Hologram have its own property to be different from general photograph. The first character of Hologram reproduction is cubic effect. Hologram reappear distribution of original dispersion light that disperse from substance when make a hologram. It is the second character that reproduction is not effected by hologram with a part missing. It is the third character that reproduction of hologram have each of special property in a real image and a virtual image. The difference between holography and photography, and a kind of luminous source and a property of sensitive material that use when make a hologram are explained in this treatise.