Abstract: Extremely high rapid evaporation could occur when high-temperature particles contact with low-temperature liquid. This kind of phenomenon is associated with the safety of engineering and the problems in high-transient multi-phase flow and heat transfer. In this paper, a special visualized experiment facility for small-scale interaction of high-temperature particles with coolant has been set up in the laboratory and the whole processes of the particles falling down have been recorded by a high-speed video camera. A series of experiments of a particle with different diameters and temperatures, falling into different sub-cooled liquids have been carried out, and the results have been analyzed and discussed. It is pointed out that the temperature and diameter of high-temperature particles and sub-cooled liquid are the important factors to affect the movement of particles.