  We discuss the prospect of studying physics at short distances, such as
Planck length or GUT scale, using supersymmetry as a probe. Supersymmetry
breaking parameters contain information on all physics below the scale where
they are induced. We will gain insights into grand unification (or in some
cases string theory) and its symmetry breaking pattern combining measurements
of gauge coupling constants, gaugino masses and scalar masses. Once the
superparticle masses are known, it removes the main uncertainty in the analysis
of proton decay, flavor violation and electric dipole moments. We will be able
to discuss the consequence of flavor physics at short distances quantitatively.
