  We present a perturbative QCD calculation of diffractive $D_s$ production in
charged current deep inelastic scattering. In the two-gluon exchange model, we
analyze the diffractive process $\nu N \to \mu^- N \Ds$, which may provide
useful information for the gluon structure of nucleons and the diffraction
mechanism in QCD. The cross section of diffractive $D_s$ production with
$\xBj=0.005$-0.05 and $E_\nu=50$ Gev is found to be $2.7\times10^{-5}$ pb. In
spite of this small cross section, the high luminosity available at the
$\nu$-Factory in the future would lead to a sizable number of diffraction
events.
