  We analyzed 12-year Fermi Large Area Telescope gamma-ray data in the inner
Galaxy centered at (l=30$^{\circ}$, b=0$^{\circ}$) and (l=330$^{\circ}$,
b=0$^{\circ}$). We found significant hardening of the spectrum of the diffuse
gamma-ray emission in these regions as previously reported. We further deduced
that the diffuse gamma rays can be divided into two components from the
likelihood analysis. One component is associated with the total gas column
density and reveals a soft spectrum, while the other is associated with the HII
gas and presents a hard spectrum. Assuming the diffuse gamma-ray emissions are
mainly produced through the interaction between cosmic rays (CRs) and the
ambient gas, these two components are produced by the CR populations with
spectral indices of 2.8 ("soft") and 2.3 ("hard"), respectively. We argue that
the hard CR population may come from the vicinity of the CR accelerators. The
soft CR population has a similar spectral shape and density as measured in the
solar neighborhood, which implies a uniform CR "sea" with a similar density and
spectral shape in the Galaxy.
