  We study Yukawa unification in string models with moduli-dominant SUSY
breaking. This type of SUSY breaking in general leads to non-universal soft
masses, i.e., soft scalar masses and gaugino masses. Such non-universality is
important for phenomenological aspects of Yukawa unification, i.e., successful
electroweak breaking, SUSY corrections to the bottom mass and the branching
ratio of $b \to s \gamma$. We show three regions in the whole parameter space
which lead to successful electroweak breaking and allow small SUSY corrections
to the bottom mass. For these three regions we investigate the $b \to s \gamma$
decay and mass spectra.
