The Indian Madder tree and the Japanese Pagoda Tree were selected for use as a natural red dye and a natural yellow dye, respectively. A simplified method of dyeing with these dyes was tried in the following way: The material containing the coloring matter was ground into powder and extracted by water at 80ºC. Silk fabric was then dyed with the residual material extract. In addition to these dyes, Gardenia Blue(GB) was used as a natural blue dye. The preparation of a color triangle was then attempted using these three dyes.　The extraction efficiency was remarkably promoted by breaking up the material containing the coloring matter. By combining the two natural dyes and GB, the color triangle was prepared successfully. Therefore, the dyeing of the pre-mordanted silk fabric and the cotton fabric treated with a cationic agent was possible to achieve in one step.