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 C_0.01F, respectively; The relative growth rate in height was decreased by 6.79% compared with that of C_0.01F, 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.