  We review the recent progress in the Big-Bang nucleosynthesis which includes
the standard and non-standard theory of cosmology, effects of neutrino
degeneracy, and inhomogeneous nucleosynthesis within the framework of a
Friedmann model. As for a non-standard theory of gravitation, we adopt a
Brans-Dicke theory which incorporate a cosmological constant. We constrain
various parameters associated with each subject.
