  Now creation of big catalogs of galaxies for measurement of baryon acoustic
oscillation (BAO) is actively conducted. Existing and planned in the near
future surveys are directed on the range of red shifts of z.2. However, some
popular models of dark energy (DE) give the maximum deviation from \Lambda CDM
at z>2 therefore we investigated sensitivity of hypothetical high redshift
surveys to the model of DE. We have found that with the increase of the number
density of detected galaxies at z>2 high redshift observations may give better
constraints of DE parameters.
