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 situation where rapid phase exchanges exist, the drag forces on some components in the system may have great different properties from those in general fluid phenomena, the process and phenomena is very complicated. A series of experiments of different temperature, cold liquid temperature, and one or several high-temperature particles falling into the cold liquid were performed using the lab experiment facility. The sphere falling-down speed are recorded by high-speed camera, moving curves are obtained, and a few instructive conclusions are carried out. This study builds an experimental foundation for further investigating on high-speed transient evaporation heat transfer.