Abstract: The experiment was carried on using 2-year-old potted Malus hupehensis Rehd. seedlings with the carbonized branches from‘Red Fuji’apple tree pruned in winter applied，which were pyrolysised at temperature of 400，600 and 700 ℃ respectively．It was investigated that the photosynthetic performance，plant growth，root activity and root architecture parameters of Malus hupehensis seedlings after carbonized powder of apple branches were applied to the pots with the mass ratio of 1% and 2%. The results showed that the leaf net photosynthetic rate，plant height，stem diameter，total dry weight，root activity，root fractal dimension，total root length，root diameter，root surface-area and root volume were all increased significantly after applied with carbonized powder of apple branch to the soil，and all of them increased with the increase of the branch carbonization temperature from 400 ℃ to 700 ℃. The root structure of Malus hupehensis seedlings was more complex after treated by carbonized branches. The effect of application 2% carbonized powder of apple branches to the soil is better than that of 1%.

Key words: apple, carbonized branch, carbonization temperature, Malus hupehensis, photosynthesis, root architecture