  We calculate the decay constants of $D_s$ and $D_s^{*}$ with $\bar{B}^0 \ra
D^{+}\ell^{-}\nu$ and $\bar{B}^0 \ra D^{+}D_s^{-(*)}$ decays. In our analysis
we take the factorization method including non-factorizable term contributions
and used two different form factor behaviours (constant and monopole-type) for
$F_0(q^2)$. We also consider the QCD-penguin and Electroweak-penguin
contributions in hadronic decays within the NDR renormalization scheme at NLO
calculation. We estimate the decay constant of the $D_s$ meson to be $233\pm49$
${\rm MeV}$ for (pole/pole)-type form factor and $255\pm54$ ${\rm MeV}$ for
(pole/constant)-type form factor. For $D_s^{*}$ meson, we get $f_{D_s^{*}} =
346 \pm 82$ ${\rm MeV}$, and $f_{D_s^{*}}/f_{D_s} = 1.43 \pm 0.45$ for
(pole/constant)-type form factor.
