Abstract: The dilute gas-particle flows in a cyclone chamber with axial and tangential inlers of different swirl numbers were studied by using a Phase-Doppler Particle Anemometer(PDPA).The measured two-phase axial,tangential time-averaged velocities and fluctuation velocities under the same overall air flow-rate,with swirl numbers of 0,0.5 and 1.0 respectively,are reported here.The results show that the swirl intensity has a remarkable effect on the profiles of axial velocity,the vortex structure of tangential velocity,the two-phase fluctuation velocity and the anisotropy of turbulence.The swirl can generally reduce two-phase turbulence.The intensity of turbulent fluctuation and its anisotropy decrease significantly with increasing swirl number at first,and they increase a little while the swirl number exceeds 1.