Abstract: This paper provided a preparation and measurement platform of energy storage materials, and described the working principle of the experiment station. Based on the experiment platform, we can microscopically observe the crystallization process of the sample under ultrasonic or not, and analyze the temperature of the sample during cooling process. It is found that ultrasonic can reduce the degree of supercooling of water, make the supercooled water formation of crystal nucleus in advance, shorten the freezing time of samples. The experiment results show that ultrasonic can not only lower the crystallization degree of supercooling of water, but also effectively refine the grain size.