To improve the particle collection performance and reduce the liquid volume of spray in the cyclone scrubber, experimental and numerical studies have been conducted. Particle deposition points were simulated with and without particle re-entrainment. Effect of surfactant concentration in spray liquid on particle collection performance was experimentally investigated. From the simulation results, particles with diameters of 1.0 and 2.5 mum are deposited mainly on the upper cylindrical wall and bottom section of the conical wall. These results indicate that the spray nozzle position at the upper cylindrical wall is effective to improve the collection performance of the cyclone scrubber. Furthermore, from the experimental results, adding surfactant to the spray liquid improved the collection performance compared with the water sprayed to the at the same liquid flow rate. The addition of the surfactant to the spray liquid decreased the surface tension of the spray liquid and reduced the size of the spray droplets, so that droplets more easily collided with the particles. From these results, it is clear that addition of surfactant to spray liquid is effective to improve the collection performance and reduce the spray liquid volume.