Abstract: Numerical simulation and experimental tests on airflow characteristics in a fluidized bed pyrolysis reactor was conducted,aimed at investigating the influence of air distribution system configuration to flow field uniformity. The inner diameter of air supply pipe was increased appropriately and two rectifying pipes with small inner diameter were added to the vertical pipe. The results shows that the airflow diffusion goes faster,and the airflow adherence and deflection get greatly alleviated. When the inner diameter of the rectifying pipe was 30 or 35 mm,the airflow deflection is almost eliminated. The air distribution plate,able to stabilize gas pressure and homogenize gas currents,can obviously reduce central gas velocity and improve flow field uniformity.