Abstract: Experimental study on liquid periodically boils at different heating power and analysis the experimental phenomenon and data.A correlation is given to describe the relationship between the period of geysering and heating power.The result shows that the liquid periodically boils and various flow patterns alternately occur.The refilling of cooler liquid causes significant change of temperature and pressure in the system.The period of geysering decreases with the increase of heating power.The flowing in the system varies more greatly as well as the pressure and temperature of liquid.Furthermore,a correlation is given to describe the relationship between the period of geysering and heating power.