  We study moduli-dominated SUSY breaking within the framework of string
models. This type of SUSY breaking in general leads to non-universal soft
masses, i.e. soft scalar masses and gaugino masses. Further gauginos are
lighter than sfermions. This non-universality has phenomenologically important
implications. We investigate radiative electroweak symmetry breaking in the
mass spectrum derived from moduli-dominated SUSY breaking, where the lightest
chargino and neutralino are almost gauginos. Moreover, constraints from the
branching ratio of $b \to s \gamma$ and the relic abundance of the LSP are also
considered. The mass spectrum of moduli-dominated SUSY breaking is favorable to
the experimental bound of the $b \to s \gamma$ decay decreasing its branching
ratio. We obtain an upper bound for the gravitino mass from the cosmological
constraint.
