  Stellar fundamental parameters are important in the asteroseismic study of
Kepler light curves. However, the most used estimates in the Kepler Input
Catalog (KIC) are not accurate enough for hot stars. Using a sample of B stars
from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST)
spectral survey, we confirmed the systematic underestimation in KIC effective
temperature and overestimation in KIC surface gravity. The good agreement
between LAMOST and other follow-up observations proved the accuracy of
effective temperature and surface gravity of B stars derived from LAMOST
low-resolution spectra. By searching through LAMOST data, we found four
misclassified main-sequence B stars in the Kepler field, which had been
previously classified as A-type variables. We present spectroscopic and
detailed frequency analysis of these four stars based on LAMOST spectra and
Kepler photometry.
