A new velocity interferometer system called all-fiber white-light velocity interferometic system of any reflector (FVISAR) is demonstrated. The important developments of the FVISAR are discussed, such as the perfect space-interference property and the potential to work with very short coherence length light source even if white-light, in comparison with the conventional velocity interferometric system of any reflector(VISAR) which consists of complicated discrete optical elements. The key points in designing a FVISAR are described in detail, and an experimental FVISAR system with very low surce power is reported.Preliminary tests to the FVISAR were conducted using the Hopkinson Bar system. Results show that the observed free-surface velocities of LY12 aluminum samples were in good agreement with theoretical estimations by impedance match. The oscillations of the free surface velocity of the LY12 aluminum samples during the loading and unloading processes can be detected and observed clearly, which results from the wave reflections between the free surface and the steel bar/sample interface.