  About 766 $\delta$ Scuti stars were observed by LAMOST by June 16, 2017.
Stellar atmospheric parameters of 525 variables were determined, while spectral
types were obtained for all samples. In the paper, those spectroscopic data are
catalogued. We detect a group of 131 unusual and cool variable stars (UCVs)
that are distinguished from the normal $\delta$ Scuti stars (NDSTs). On the H-R
diagram and the $\log g-T$ diagram, the UCVs are far beyond the red edge of
pulsational instability trip. Their effective temperatures are lower than
6700\,K with periods in the range from 0.09 to 0.22\,days. NDSTs have
metallicity close to that of the Sun as expected, while UCVs are slightly metal
poor than NDSTs. The two peaks on the distributions of the period and stellar
atmospheric parameters are all caused by the existence of UCVs. When those UCVs
are excluded, it is discovered that the effective temperature, the
gravitational acceleration and the metallicity all are correlated with the
pulsating period for NDSTs and their physical properties and evolutionary
states are discussed. The detecting of those UCVs indicates that about 25\% of
the known $\delta$ Scuti stars may be misclassified. However, if some of them
are confirmed to be pulsating stars, they will be a new-type pulsator and their
investigations will shed light on theoretical instability domains and on the
theories of interacting between the pulsation and the convection of solar-type
stars. Meanwhile, 88 $\delta$ Scuti stars are detected to be the candidates of
binary or multiple systems.
