wr pre'sent a systematic-way for deriving a four-dimensional (4D) effective action of the five-dimensiDnal (5D) orbifold supergratrity respecting the N = 1 ofr-shell structure. As an illustrating exainple, we derive a 4D elfective theory ofthe 5D gauged supergravity with a universal hypermultiplet and generic gaugings, which includes the 5D heterotic Mtheory and the supersymmetric Randall-Sundrum model as special limits of the gauging pa vameters, We show the vacuum structure of such model,

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... cially the nature of moduli stabilization, introducing perturbative superpotential terrns at the orbifold fixed pomis,