  All of the 14 subfields of the Kepler field have been observed at least once
with the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST,
Xinglong Observatory, China) during the 2012-2014 observation seasons. There
are 88,628 reduced spectra with SNR$_g$ (signal-to-noise ratio in g band)
$\geq$ 6 after the first round (2012-2014) of observations for the
LAMOST-Kepler project (LK-project). By adopting the upgraded version of the
LAMOST Stellar Parameter pipeline (LASP), we have determined the atmospheric
parameters ($T_{\rm eff}$ , $\log g$, and $\rm [Fe/H]$) and heliocentric radial
velocity $v_{\rm rad}$ for 51,406 stars with 61,226 spectra. Compared with
atmospheric parameters derived from both high-resolution spectroscopy and
asteroseismology method for common stars in Huber et al. (2014), an external
calibration of LASP atmospheric parameters was made, leading to the
determination of external errors for the giants and dwarfs, respectively.
Multiple spectroscopic observations for the same objects of the LK-project were
used to estimate the internal uncertainties of the atmospheric parameters as a
function of SNR$_g$ with the unbiased estimation method. The LASP atmospheric
parameters were calibrated based on both the external and internal
uncertainties for the giants and dwarfs, respectively. A general statistical
analysis of the stellar parameters leads to discovery of 106 candidate
metal-poor stars, 9 candidate very metal-poor stars, and 18 candidate
high-velocity stars. Fitting formulae were obtained segmentally for both the
calibrated atmospheric parameters of the LK-project and the KIC parameters with
the common stars. The calibrated atmospheric parameters and radial velocities
of the LK-project will be useful for studying stars in the Kepler field.
