Abstract: In this experiment, the seedlings of Cunninghamia lanceolata were used as materials, and a single factor test method was used to explore the effect of different concentrations of 6−benzylaminopurine(6−BA) on antioxidant enzyme activities in leaves, stems and roots of C. lanceolata seedlings under aluminum stress. The results showed that the malondialdehyde(MDA) content and antioxidant enzyme activities in the 3 tissues examined had different changes with the increase of 6−BA concentration when compared with CK. Specifically, the MDA content and peroxidase(POD) activity was highest in leaves, followed by that in stems and roots under 6−BA treatment. In contrast, catalase(CAT) activity was strongest in roots, followed by that in stems and leaves. Similarily, polyphenol oxidase(PPO) activity was weakest in leaves, followed by that in roots and stems. In general, 6−BA reduced the content of MDA in these tissues and increased the activities of CAT, PPO and POD, suggesting that 6−BA can alleviate the toxicity of aluminum to C. lanceolata to a certain extent.