In addition to pboto-elastic effect, we have also considered rotation and electro-optic effects in calculating Brillouin tensors of LiNbO3 crystals. After careful design and adjustment of the experiment system. Brillouin spectra of LiNbO3 crystals were measured in the 90° scattering scheme. We measured all independent elastic and piezoelectric constants of LiNbO3 crystals made in China in the hypersonic region. The spatial were also measured in the 180?back scattering scheme. Experimental results are in good agreement with calculations.