  We examine experimental constraints on scharm-stop flavor mixing in the
minimal supersymmetric standard model, which arise from the experimental bounds
on squark and Higgs boson masses, the precision measurements of W-boson mass
and the effective weak mixing angle, as well as the experimental data on
B_s-\bar B_s mixing and b -> s gamma. We find that the combined analysis can
put rather stringent constraints on \tilde{c}_L-\tilde{t}_L and
\tilde{c}_L-\tilde{t}_R mixings. As an illustration for the effects of such
constraints, we examine various top-quark flavor-changing neutral-current
processes induced by scharm-stop mixings at the LHC and find that their maximal
rates are significantly lowered.
