The baryon acoustic oscillations (BAOs) are powerful tool to constrain cosmic expansion history, and therefore to reveal the nature of dark energy. One advantage in the BAO measurement is that we can in principle measure the angular diameter distance and hubble distance separately. This can be achieved by considering the redshift-space distortion (RSD) which makes galaxy distribution statistically anisotropic. Hence, the precise modeling of the RSD is a crucial task. In this talk, we first discuss the precise modeling of RSD based on perturbation theory. Then we will present observational constraints (though preliminary) on the angular diameter distance and hubble distance, applying our model to the SDSS DR7 power spectra.