  We present the first search for the decay $D^+_{s}\to \omega e^{+}\nu$ to
test the four-quark content of the $D^+_{s}$ and the $\omega$-$\phi$ mixing
model for this decay. We use 586 $\mathrm{pb}^{-1}$ of $e^{+}e^{-}$ collision
data collected at a center-of-mass energy of 4170 MeV. We find no evidence of a
signal, and set an upper limit on the branching fraction of
$\mathcal{B}(D^+_{s}\to\omega e^+\nu)<$0.20% at the 90% confidence level.
