Abstract:An outdoor pot experiment was conducted to study the effects of different dosages of biochar (0, 1%, 2%, 4%) on yellow brown soil physicochemical properties and the growth of Cinnamomum camphora seedings. Results showed that: 4% of biochar dosage amended yellow-brown soil most effectively, compared with chemical fertilizer treatment (C0F), soil total porosity, saturation moisture capacity, capillary moisture capacity and field moisture capacity were significantly increased, while soil bulk density was significantly reduced (P<0.05). Biochar increased soil pH significantly (P<0.05). Biochar improved nitrogen and phosphorus availabilities, which was the highest in N availability with low biochar dosage and the highest in P availability with high biochar dosage. With the dosage 1%, Cinnamomum camphora’s leaves biomass reached the maximum (41.54 g), 141.53% and 11.16% higher than those of the control (CK) and C0.01F, respectively; The relative growth rate in height was decreased by 6.79% compared with that of C0.01F, which is helpful for dwarf trees. So, the appropriate dosages of biochar were different for soil physico-chemical properties and for the growth of Cinnamomum camphora seedings. Considering the economic benefits, 1% of biochar dosage is appropriate to leaf biomass of Cinnamomum camphora.