  The hidden SU(5)' with one family, 10 and 5-bar, breaks supersymmetry
dynamically. From the effective Lagrangian approach, we estimate the hidden
sector gaugino candensation scale, the dilaton stabilization and the resulting
gravitino mass. In some models, this gravitino mass can be smaller than the
previous naive estimate. Then, it is possible to raise the SU(5)' confining
scale above 10^{13} GeV.
