  We report the discovery of eight new quasars in one extragalactic field (five
degree centered at RA=$08^h58^m08.2^s$, Dec=$01^o32'29.7''$) with the LAMOST
commissioning observations on December 18, 2009. These quasars, with $i$
magnitudes from 16.44 to 19.34 and redshifts from 0.898 to 2.773, were not
identified in the SDSS spectroscopic survey, though six of them with redshifts
less than 2.5 were selected as quasar targets in SDSS. Except one source
without near-IR $Y$-band data, seven of these eight new quasars meet a newly
proposed quasar selection criterion involving both near-IR and optical colors.
Two of them were found in the 'redshift desert' for quasars ($z$ from 2.2 to
3), indicating that the new criterion is efficient for recovering the missing
quasars with similar optical colors as stars. Although LAMOST met some problems
during the commissioning observations, we were still able to identify other 38
known SDSS quasars in this field, with $i$ magnitudes from 16.24 to 19.10 and
redshifts from 0.297 to 4.512. Our identifications imply that a substantial
fraction of quasars may be missing in the previous quasar surveys. The
implication of our results to the future LAMOST quasar survey is discussed.
