  In Supersymmetry with large $\tan\beta$ values, the lighter stau
($\tilde{\tau}_{1}$) may be lighter than the lightest chargino
($\tilde{\chi}^{\pm}_{1}$). The decay $\tilde{\chi}^{\pm}_{1} \to
\tilde{\tau}^{\pm}_{1} \nu_{\tau}$, followed by $\tilde{\tau}^{\pm}_{1} \to
\tilde{\chi}^{0}_{1} \tau$, alters a phenomenology of the chargino production.
We study the chargino pair production at future $e^{+}e^{-}$ linear colliders.
