We explored the color gene of Guangzhou's traditional culture and natural environment, extracted the recommended urban color spectrum with "a sun-shining color Gouache" specially belonging to Guangzhou. The main color tone is the sunshine-feeling intermediate colors”- the medium-high clarity、medium-low purity yellow-grey. This sunny and bright color is most suitable for the characteristics of Guangzhou's natural environment and historical and cultural traditions. We applied these colors to urban space, such as historical blocks, riverside landscape belt and arcade commercial street.