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With a discrete $Z_2$ symmetry being imposed, we introduce a real singletscalar $S$ to the Higgs triplet model with the motivation of explaining thetentative evidence for a spectral feature at $E_\gamma$ = 130 GeV in the FermiLAT data. The model can naturally satisfy the experimental constraints of thedark matter relic density and direct detection data from Xenon100. The doublycharged and one charged scalars can enhance the annihilation cross section of$SS\to\gamma\gamma$ via the one-loop contributions, and give the negligiblecontributions to the relic density. $<\sigmav>_{SS\to\gamma\gamma}$ for$m_{S}=130$ GeV can reach $\ord(1)\times10^{-27} cm^3 s^{-1}$ for the smallcharged scalar masses and the coupling constant of larger than 1. Besides, thismodel also predict a second photon peak at 114 GeV from the annihilation$SS\to\gamma Z$, and the cross section is approximately 0.76 times that of$SS\to\gamma \gamma$, which is below the upper limit reported by Fermi LAT.Finally, the light charged scalars can enhance LHC diphoton Higgs rate, andmake it to be consistent with the experimental data reported by ATLAS and CMS.

130 GeV gamma-ray line and enhancement of $h\to\gamma\gamma$ in the Higgs triplet model plus a scalar dark matter