Abstract: We introduced the theory of Brillouin scattering in brief and presented its extensive utilization, described the spectrograph for Brillouin scattering and its development; we narrated the development of Brillouin scattering experimental system, especially that of Brillouin scattering experimental system under the high temperature and high pressure conditions, some important results of other researchers were presented and compared; the establishment of the first national high-temperature and high-pressure Brillouin scattering system was covered, its accuracy and superiority were discussed, and the elastic properties of materials were studied. 

Key words: Brillouin scattering, high-temperature high-pressure, acoustic velocity