Brillouin dynamic grating (BDG) based on stimulated Brillouin scattering is a new technology proposed in recent years. It is one of the hot topics in the area of fiber optic commutations and sensing due to its superiorities in separating writing and reading beams, tunability of location and spectra, and high speed reconfiguration over traditional fiber grating technique. It gains much more interest in distributed optical fiber sensing area since it overcomes the limitation of spatial resolution induced by the phonon′s lifetime and it can reach a much higher sensitivity. Current status and advances achieved in BDG are summarized along the technological developing trace. Technologies and applications of BDG based on distributed optical fiber sensing technologies are introduced. Existing problems and future trends are also discussed.