  We discuss the role of F-term uplifting in stabilizing moduli within the
framework of heterotic string theory. It turns out that the uplifting sector
plays an important role in fixing the volume modulus at one of the self-dual
points of a modular invariant potential. For the volume modulus stabilized at a
self-dual point, the F-term uplifting leads to the dilation stabilization which
can naturally yield the mirage mediation pattern of soft supersymmetry breaking
terms. Generalizing to the case with anomalous U(1) gauge symmetry, we also
find that the U(1) sector generically gives a contribution to sfermion masses
comparable to the dilaton mediated one while maintaining the mirage mediation
pattern.
