Abstract: The mean and r.m.s velocities of solid-liquid flow system were measured by Particle Dynamic Analyzer in a fully baffled tank agitated by axial impellers.The effect of particle volumetric concentration was investigated as well.The results showed that the velocity profiles for two-phase flow were similar with those of the single-phase flow in the impeller region.The axial velocities for two-phase flow were higher than corresponding velocities of single-phase,and the maximum relative velocity occurred at the blade tip with 0.03 U tip in value.The turbulence levels were in general lower,about 50% reduction,than those of single-phase flow in the impeller region.Tangential velocities of two-phase flow decreased with increasing particle concentration while the axial velocities remained the same.Due to the presence of the particles,the discharge jet width became narrow.