Abstract: In order to solve the problem of uneven distribution and large concentration deviation of air powder in coal-fired units, an air powder two-phase adjustable coal powder distributor was designed. It was equipped with a special shaped pipe at the elbow, which can improve the distribution characteristics of air powder. Numerical simulation was carried out on the two-phase flow characteristics of pulverized coal distributor, and the distribution of separation efficiency, pressure loss, wear, velocity field and concentration field was studied. Results show that the distribution deviation of air powder can be kept below 10% or even 5% by using the special-shaped coal powder distributor, and the wear mostly occurs in each branch of thick and thin phase and the resistance coefficient is very low. It is beneficial to realize the uniform distribution of primary air powder, ensure the stability and safety of unit operation, and meet the trend of flexibility transformation of coal-fired unit.