Abstract: The filed experiment of different biochar rates, which the amounts were 0 (CK), 6, 12, 24, 48 t/hm² , was conducted in red soil. Soil physical and chemical properties and maize yield were analyzed. The results showed that: compared with CK, the soil bulk density of different biochar rates were reduced by 4.8%-16.3%, and soil capillary porosity were increased by 8.1%- 21.6% . The soil aggregate that more than 0.5 mm was decreased with the increasing of biochar amounts, but the soil aggregate that less than 0.5 mm was increased with the increasing of biochar amounts. Soil MWD in 6, 12, 24, 48 t/hm² biochar were cut down by 7.93%, 25.39%, 30.15% and 28.57% compared with CK. However, their soil pH and CEC were increased by 0.19- 1.02 units and 0.80-2.46 cmol/kg. Finally, the maize yield of biochar were increased 32.5%-80.0% compared with CK, and the fitting curve equation was y=-5.9507x²+358.45x+6689.7, therefore, the best rate of biochar application was 30 t/hm² in red soil.