Fused silica and K9 glasses were used for longitudinal stimulated Brillouin scattering (LSBS) instead of traditional medium of liquids or gases. A single longitudinal mode 1.064 μm laser which is electro-optical Q-modulation is used as pump laser. Influences of pulse duration, power and pulse repetition of pump laser on pulse compression of LSBS and energy reflectivity of scattering light were investigated. It is concluded that shorter pulse duration is with higher energy reflectivity and high pulse repetition gets higher energy reflectivity. At the same time, energy reflectivity of scattering in 300 mm K9 glass light is higher than that in 170 mm fused silica, when the focus length is 500 mm. And high energy reflectivity above 90% could be obtained in 170 mm fused silica long and 300 mm K9 glass when pump pulse repetition is 1 Hz. LSBS of pump laser with multi-longitudinal mode had been investigated in the experiments and it is proved that the optical breakdown could happen at the same time with SBS.