Abstract: The experimental results show that there is a higher heat transfer intensity of the thermal interaction between droplets and hot surface heated over the transition temperature of Leidenfrost Phenomena. The transition temperature is very important in the research of Leidenfrost Phenomena. The values of transition temperatures, LFT and TSF, based on the experiments are given and the TSF is first proposed in this paper. A dimensionless equation predicting the LFT and TSF of pure liquid droplet impinging on hot metal surface is also proposed. The influences of the parameters which are concerned in the field of chemical engineering, such as initial temperature, components and concentration of liquid droplet, on the transition temperature of Leidenfrost Phenomena were studied. In our experiments, various combinations of liquid-solid surfaec were used, for example, pure liquid, solution, suspension, emulsion and complex component liquid versus stainless steel, copper, porcelain and so on.