Abstract: This study was to find out a cost-efficient way to dye wood with recycled dyes so as to reduce the water pollution generated during dyeing process and improve dyeing efficiency.The Populus tomentosa veneer, which was dyed with six acid dyes, was selected as the dyeing sample.The vacuum-pressure dyeing method was applied to conduct monochromatic dyeing and mixed dyeing.Results show that it is feasible to dye wood with recycled dyes under the assistance of computer color matching system.It is also indicated that when dying with single dye, the dye uptake is in proportion with the dye density of dyeing solutions;while in the case of mixed dyeing, the different dyes do not uptake in proportion with their respective densities in the dyeing solutions, and this demonstrats the differences of bonding and penetrating ability of wood with different dyes.