  In this paper, we propose the sterile neutrino portal dark matter in
$\nu$THDM. This model can naturally generate tiny neutrino mass with the
neutrinophilic scalar doublet $\Phi_{\nu}$ and sterile neutrinos $N$ around TeV
scale. Charged under a $Z_2$ symmetry, one Dirac fermion singlet $\chi$ and one
scalar singlet $\phi$ are further introduced in the dark sector. The sterile
neutrinos $N$ are the mediators between the DM and SM. Depending on the
coupling strength, the DM can be either WIMP or FIMP. For the WIMP scenario,
pair annihilation of DM into $NN$ is the key channel to satisfy various bounds,
which could be tested at indirect detection experiments. For the FIMP scenario,
besides the direct production of DM from freeze-in mechanism, contributions
from late decay of NLSP is also important. When sterile neutrinos are heavier
than the dark sector, NLSP is long-lived due to tiny mixing angle between
sterile and light neutrinos. Constrains from free-streaming length, CMB, BBN
and neutrino experiments are considered.
