Laser Doppler Anemometer has been used to measure the flow field characteristics near the interface around a moving bubble in the presence of ultrafine particles. In order to model a moving bubble the bubble was fixed into the counter-flow liquid by a metal mesh. Experimental materials are air and water and the parti-ties are complex oxidate powder. Experiments were carried out under the operating conditions: the liquid flow velocity Uo is 12.6cm/s, the equivalent diameter d, is 0.6cm, the mass concentration of particle is 0.2%, the average particle diameter is about 10mm and the density is 2g/cm3. The velocity profiles of both frontal and tail-vortex areas were measured respectively. The experimental results show tllat the velocity fields RIFe obviously changed in the existence of particles. In the frontal area of the bubble both tangential and normal velocities de-crease due to the presence of particles, but in tail vortex area, the tan gential velocities increase remarkably and normal velocities rise gradually from the center towards the fringe in the opposite tendency to that of no par-ficles. The influences of flow field change in the presence of particles on gas-liquid mass tran sfer are analyzed and discussed.