The invention discloses an exact locating method for fault points of a
submarine cable. The exact locating method for the fault points of the
submarine cable comprises the following steps of: realizing real time online monitoring of the
submarine cable by utilizing BOTDR (brillouin
optical time domain reflectometer) or BOTDA (brilouin optical
time domain analysis); carrying out combined analysis by utilizing strain / temperature information, a submarine
topography and geologic structure and construction details carried by a
brillouin scattering signal; and extracting feature points, and establishing a
database so as to largely improve the location precision. After the
database is established, complex
data query and calculation operations can be saved as long as a
submarine cable has failure, thus the fault position can be quickly and exactly located, the
submarine cable can be repaired and the labors and materials are largely saved.