The chromatism and dye up take were studied by orthogonal method according to the changes of the parameters of dyeing. The 0.5 mm sliced Paulownia veneer was dyed in aqueous solution of the acid bright red. The result showed that NaCl concentration was the most important factor to the chromatism of dyed samples before and after dyeing , and the best concentration was 0.5%. The dyeing temperature was the second factor and 50 ℃ was appropriate to both chromatism and dye up take. The concentration of surface active agent was the third factor and best concentration was 0.1%. As the 4th factor, the most suitable treating time was 4 hours .Acetic acid was the 5th factor to dyeing effects of Paulownia veneer with the best concentration of 2%. There was not obvious change in chromatism caused by concentration change of dye solution , and the best concentration was 0.5% in dye up take .