The study found that the major factors affecting dye up take were the constitution of the liquor and the parameters of dyeing process. The 0.5 mm sliced Paulownia elongata veneer was dyed in an experiment by the acid bright red. It was shown that NaCl produced an obvious effect. The percent of dye up take increased with the increase of NaCl concentration and then decreased after highest point at 1%. The dye up take increased with increase of liquor temperature. The percent of dye exhaustion gradually ascended with the time going in experiment until to reach the adsorption equivalent state. The result was satisfied for the 0.5 mm sliced Paulownia elongata veneer at 90 ℃ for 3 h. The dye up take was different with the change of dye concentration, and the best concentration was 1%. The adsorption was different with the change of the bath ratio of the liquor to wood. The suitable bath ratio was 15. Acetic acid took an active part in promoting the percentage of exhaustion with the best concentration of 1.5%.