  Homogeneous metallicities and continuous high-precision light curves play key
roles in studying the pulsation properties of RR Lyrae stars. By cross-matching
with LAMOST DR6, we have determined 7 and 50 Non-Blazhko RRab stars in the
Kepler and K2 fields, respectively, who have homogeneous metallicities
determined from low-resolution spectra of the LAMOST-Kepler/K2 project. The
Fourier Decomposition method is applied to the light curves of these stars
provided by the Kepler space based telescope to determine the fundamental
pulsation periods and the pulsation parameters. The calculated amplitude ratios
of R21, R31 and the phase differences of {\phi}21, {\phi}31 are consistent with
the parameters of the RRab stars in both the Globular Clusters and the Large
Magellanic Cloud. We find a linear relationship between the phase differences
{\phi}21 and {\phi}31, which is in good agreement with the results in previous
literature. As far as the amplitude, we find that the amplitude of primary
frequency A1 and the total amplitude Atot follow either a cubic or linear
relationship. For the rise time RT, we do not find its relevance with the
period of the fundamental pulsation mode P1, or Atot and {\phi}21. However, it
might follow a linear relationship with R31. Based on the homogeneous
metallicities, we have derived a new calibration formula for the relationship
of period-{\phi}31-[Fe/H], which agrees well with the previous studies.
