  The Inert Doublet Model(IDM) is one of the simplest extensions beyond
Standard Model(SM) with an extended scalar sector, which provide a scalar dark
matter particle candidate. In this paper, we investigate the double charged
Higgs production at $\gamma\gamma$ collider. By scanning the whole parameter
space, we obtain the parameter points corresponding to the correct relic
abundance of dark matter. After applying all theoretical and experimental
constraints, the parameter space for the existence of dark matter is extremely
restricted. We perform the analysis for the signal of $H^+H^-$ production in
the IDM and the SM backgrounds, and the optimized selection conditions are
chosen in kinematic variables to maximize signal significance. Comparing signal
with backgrounds, we obtain the parameter points which can be detected at
future $\gamma\gamma$ collider experiments.
