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We present a scalar dark matter (DM) model where DM ($X_I$) is stabilized bya local $Z_2$ symmetry originating from a spontaneously broken local dark$U(1)_X$. Compared with the usual scalar DM with a global $Z_2$ symmetry, thelocal $Z_2$ model possesses three new extra fields, dark photon $Z^{'}$, darkHiggs $\phi$ and the excited partner of scalar DM ($X_R$), with the kineticmixing and Higgs portal interactions dictated by local dark gauge invariance.The resulting model can accommodate thermal relic density of scalar DM withoutconflict with the invisible Higgs branching ratio and the bounds from DM directdetections, thanks to the newly opened channels, $X_I X_I \rightarrow Z^{'}Z^{'}, \phi\phi$. In particular, due to the new particles, the ${\rm GeV}$scale $\gamma$-ray excess from the Galactic Center (GC) can be originated fromthe decay of dark Higgs boson which is produced in DM annihilations.

Local $Z_2$ scalar dark matter model confronting galactic ${\mathrm GeV}$-scale $\gamma$-ray