  Inspired by recent results on the Higgs search from ATLAS and CMS, we extend
the SM with complex septuplet scalars. The lightest neutral component of the
septuplets is a natural cold dark Matter candidate and the charged components
can contribute to the $h\to \gamma \gamma $ decay rate, providing a significant
enhancement factor. The dark matter phenomenology and possible collider
signatures of the model are investigated. We find a dark matter candidate with
mass around 70 GeV consistent with astrophysical and direct detection
constraints. In the meanwhile, the enhancement factor of $h\to \gamma \gamma $
decay rate can be in the range 1.5\sim 2.
