The purpose of this study is to develop the latent heat storage system using erythritol as a latent heat storage material. In this study, the direct contact melting and solidification behaviors between oil and erythritol were visualized in order to investigate the characteristics of heat storage and release of erythritol. The experimental results show that the increase of erythritol bubbles was inhibited by using a perforated aluminum lattice. And it is clear that solidification height of erithritol with the lattice was lower than the height without the lattice.