  We conduct an asteroseismological analysis on the non-Blazhko ab-type RR
Lyrae star EPIC 248846335 employing the Radial Stellar Pulsations (RSP) module
of the Modules for Experiments in Stellar Astrophysics (MESA) based on the set
of stellar parameters. The atmospheric parameters as $T_\mathrm{eff}$ =
6933$\pm$70 $K$, log $g$ = 3.35$\pm$ 0.50 and [Fe/H] = -1.18 $\pm$ 0.14 are
estimated from the Low-Resolution Spectra of LAMOST DR9. The luminosity $L$ =
49.70$_{-1.80}^{+2.99}$ $L_\odot$ and mass M = 0.56 $\pm$ 0.07 $M_\odot$ are
calculated, respectively, using the distance provided by Gaia and the
metallicity estimated from the Low-Resolution Spectra. The Fourier parameters
of the light curves observed by $K2$ and RV curves determined from the
Medium-Resolution Spectra of LAMOST DR10 are also calculated in this work. The
period of the fundamental mode of the star and the residuals $r$ of the Fourier
parameters between the models and observations serve to select optimal model,
whose stellar parameters are $T_\mathrm{eff}$ = 6700 $\pm$ 220 K, log $g$ =
2.70, [Fe/H] = -1.20 $\pm$ 0.2, M = 0.59 $\pm$ 0.05 $M_\odot$, and $L$ = 56.0
$\pm$ 4.2 $L_\odot$. The projection factors are constrained as 1.20 $\pm$ 0.02
and 1.59 $\pm$ 0.13 by the blue- and red-arm observed velocities with their
corresponding RV curves derived from the best-fit model, respectively. The
precise determination of stellar parameters in ab-type RR Lyrae stars is
crucial for understanding the physical processes that occur during pulsation
and for providing a deeper understanding of its Period-Luminosity relationship.
