  We study the mass spectrum of superparticles within supersymmetric grand
unified models. For gaugino masses, it is pointed out that the GUT-relation in
the $SU(5)$ model is applicable to a more general case where a grand-unified
gauge group breaks down to the standard model gauge group by several steps. We
also show that the mass spectrum of squarks and sleptons carries the
information on the breaking pattern of the gauge symmetry. It is demonstrated
in some $SO(10)$ models how the scalar mass spectrum distinguishes various
$SO(10)$ breaking patterns from each other.
