Seoul has been developed rapidly based on the industrialization without considering environment color aspect. As a result, the city image fails to support positive affordance and aesthetic appearance. Chung-gae steet which is crowded with many signboard of stores has visual problems especially, due to the absence of recognition of environmental color scheme. Therefore, this study intended to develop a color plan and to apply on the signboard of the stores on chung-gae street by clustering areas. The purpose of this study is to prove the usefulness of the color manual which is developed in 2004 by the ministry of commerce, industry, and energy for the national environmental color plan.