  We suggest a dark matter scenario which could contribute the possible anomaly
observed by Fermi-LAT $\gamma$-ray space telescope. It is based on the model
recently proposed by Weinberg. In our scenario the gamma-ray line signal comes
from the fermionic dark matter ($M_{\rm DM}=214 $ GeV) annihilating into two
light scalars with mass around 500 MeV which in turn decay into two neutral
pions. Finally the pions can decay into two 130 GeV photons. The strong
constraint from the direct detection leaves only the channel of the dark matter
annihilation into two light scalars for both the relic density and the
Fermi-LAT gamma-ray line signal. The resulting gamma-ray spectrum is rather
broad and does not fit to the data perfectly, but the data also show there may
be fluctuation in the spectrum. There is no associated $Z$-boson or Higgs boson
production contrary to most other works where the signal comes from the loops
of charged particles. The annihilation into the other SM particles are highly
suppressed due to the small mixing from the direct detection. Future
experiments with more data will give more clues on the possible scenarios.
