  An unbroken $Z_3$ symmetry remains when local $SU(2)_X$ is broken
spontaneously by one quadruplet. The gauge boson $\chi_\mu (\bar \chi_\mu )$
carries the dark charge and is the candidate of dark matter (DM). By the
mixture of scalar boson $\phi_r$ of quadruplet and standard model (SM) Higgs,
the DM can annihilate to SM particles through Higgs portal. For investigating
the implications of vector DM, we study the relic density of DM, the direct
detection of DM-nucleon scattering and the excess of gamma-ray spectrum, which
is supported by the data from {\it Fermi} Gamma-Ray Space Telescope. We find
that with the DM mass of around $70$ GeV in our model, the excess of gamma-ray
could be fitted well with the data.
