Interior parts of automotive are made of many kinds of material types. Most of them, plastics like a PP, ABS, PC, PC/ABS and textiles like a PVC, Nylon, Polyester, make up the majority of interior parts. These interior parts have the specific colors and harmonized with adjacence parts to give inspiration and aesthetic feeling to customer. There are some kinds of dye technology to color on a part surface, such as solution dye and piece dye technology. Especially, in textile materials such as the fabric, nylon, polyester, both dye technologies are used. According to application area or design intention, the dye method can be selected. In this paper, dye technologies are introduced which is applied to carpet materials, and tested the colorfastness resistance property in a various radiant exposure conditions to find colorfastness characteristics of both dye technologies and guide applying which dye technology is suitable for parts. The test was conducted on carpet materials and compared the dye technology.