Abstract: Hydrous minerals are important carriers for moving water from the Earth's surface to the deep, so their physical and chemical properties are crucial to understanding the water cycle in the Earth's interior. In this paper, the research methods of wave velocity under high temperature and high pressure in laboratory are introduced, as well as the elastic properties and influencing factors of typical hydrous minerals. It is found that the P and S wave velocities of low-pressure hydrous minerals are generally lower than those of mantle minerals, while the values of V_P/V_S are higher than those of mantle minerals. These properties are consistent with geophysical observations in subduction zones. However, the wave velocities of some high-pressure hydrous minerals are close to those of mantle minerals. The change of wave velocity of hydrous minerals before and after dehydration can be used to reveal the cause of abnormal wave velocity in deep Earth. By modeling hydrous minerals in the earth's deep environment and comparing with geophysical observation data, the water content and wave velocity anomalies in the subduction zone can be effectively constrained. Based on existing research, this article provides an outlook for the future development direction of elastic properties research on hydrous minerals.