  The electroweak corrections at the order of $O(\alpha_{ew}m_{t(b)}^2/m_W^2)$
to the partial widths of the $\tilde{t}_2 \to \tilde{g} + t$ and $\tilde{g} \to
\tilde{t}_1 + \bar{t} $ decays (depending on the masses of the particles
involved) are investigated within the Supersymmetric Standard Model. The
relative corrections can reach the value of 10% in some parameter space, which
can be comparable with the corresponding QCD corrections. Therefore, they
should be taken into account for the precise experimental measurement at future
colliders.
