Abstract: Brillouin light detection and ranging(LIDAR)in ocean telemetry is a novel frequency detection LIDAR technology, involves Brillouin scattering, LIDAR and remote sensing technology. For this detection mode can resist amplitude noise, so it has high signal-to-noise ratio, strong anti-interference and high accuracy of measurement. Firstly, key technologies of Brillouin LIDAR were analyzed，and the development progress was introduced. Finally, a few of applications of Brillouin LIDAR in ocean telemetry and the development trend were discussed.