High repetition rate and high energy laser is realized by two-stage pre-amplifiers and two-stage main amplifiers seeded by a pulsed diodes pumped EO Q-switched single-longitudinal-mode laser with pulse repetition rate up to 1000 Hz.Detailed experimental investigation on stimulated Brillouin scattering reflectivity of a large aperture fused silica fiber is carried out using this laser source.Reflectivities of 33.3%,41.2% and 50.7% are achieved at the repetition rate of 1000,500 and 400 Hz respectively.The tapered fiber′s core diameters are 1 mm and 400 μm for its two end surfaces.More than 50% stimulated Brillouin scattering reflectivity with such high repetition rate and high energy is realized.At the repetition rate of 400 Hz,the pulse duration is compressed to 6 ns from 24 ns,with a compression ratio of 4:1.The pulse shape is free of modulation.