Fabry-Perot (F-P) interferometry can be applied to velocity history measurement for high-speed moving objects by using the Doppler effect. A F-P interferometer system has been developed with nanosecond temporal resolution and velocity resolution of 10 m/s. The system consists of a laser, a fiber probe, a F-P interferometer cavity and a streak camera. The fringe constant of the F-P interferometer is 1000 m/s. The interferometer cavity is a solid etalon, so the interference fringes need not to be adjusted and moreover greatly simplified the experiment operations. By using the system, the velocity measurements for explosive-driven flyers and electric-gun driven flyers are completed. The measured velocity of the explosive-driven flyer reaches 2 km/s, and the electric-gun driven flyer is 5 km/s.