  One-loop SUSY QCD radiative correction to $gb \to tH^{-}$ cross section is
calculated in the Minimal Supersymmetric Standard Model. We found that SUSY QCD
is non-decoupling if the gluino mass and the parameter $\mu$, $A_t$ or $A_b$
are at the same order and get large. The non-decoupling contribution can be
enhanced by large $\tan\beta$ and therefore large corrections to the hadronic
production rates at the Tevatron and LHC are expected in the large $\tan\beta$
limit. The fundamental reason for such non-decoupling behavior is found to be
some couplings in the loops being proportional to SUSY mass parameters.
