Abstract: In order to search the advantages and disadvantages of radial coal classifier, a computational fluid dynamics（CFD） simulation within the discrete phase model（DPM） framework is carried out to investigate the hydrodynamic characters such as flow field, axial and magnitude velocity, pressure drop, particle streamline and so on.The results show that the coarse powder has three separated areas such as the inner side of outer wall, the outer side of inner cone and the inner side of inner wall. The inner cone and the outer shell are easily worn, the particles are easily carried again, the vortex is easily formed in the center tube, and the deviation about coal powder concentration between the two exit tubes is large. The improvement measures such as adding the bump cone on the top of the inlet and introducing the centrifugal block in the inlet are proposed in the paper.