  We propose that a modified version of string-inspired supersymmetry breaking
schemes in \cite{wit2} and \cite{ross} may make affine level one SU(5) and
SO(10) string models with intermediate gauge symmetry breaking scale
$M_{GUT}=10^{16}GeV$ possible; doublet-triplet problem can also be solved. In
particular, we propose that some charged gauge background VEVs might be turned
on when gaugino condensation happens in the hidden sector and would break gauge
symmetry. One can dynamically determine gaugino condensation scale, local
supersymmetry breaking scale and intermediate gauge symmetry breaking scale
$M_{GUT}$ in terms of dilaton VEV. With dilaton VEV, $\langle S \rangle \sim
2$, and $E_6$ hidden sector gaugino condensation, we can obtain
$M_{GUT}=10^{16}GeV$. We also discuss how to generate the mass hierarchy within
the framework of this supersymmetry breaking scheme. We show that the large
mass hierarchy restricts string models to those that have a no-scale structure
and in which the gauge coupling function does not receive string threshold
corrections.
