Heat transfer techniques involving phase a change process are likely to play an important role in industrial devices that require the ability to remove high heat quickly. In the present work, fine mist cooling as a high heat removal technology was applied to the cooling of high temperature work material. A three-dimensional numerical simulation was developed to investigate the behavior of water particles and temperature of work material. The calculated results were in reasonably good agreement with experimental results for cooling performance of fine mist. It was found that about 50% of mist particles collide with the work material, and 20-30% of these particles evaporate after collision.