Development of a thermal print head by 3D thermal analysis The photo printer of a dye-sublimation thermal printer is widely used for a consumer use and a business use as an output device of the digital camera image. On the other hand, a thermal printer is a simple structure, and it is small suitable. Therefore, it is widely used for a direct, thermal printer and a mobile printer of the built-in type. The power saving of a thermal head have to achieve for the battery longevity in a mobile printer and the speed-up of the dye sublimation photo printer.The performance demanded from a thermal head differs respectively, and applies the technique of 3D analysis to the development of a thermal head for various pencil press of these thermal printers. In this paper, it reports on the result of review that 3D thermal analysis to the optimization of the design parameter of a power saving thermal head. And, it reports on the color printer that uses the developed power saving thermal head.