  In this paper, we investigate the problem of prescribing Webster scalar
curvatures on compact pseudo-Hermitian manifolds. In terms of the method of
upper and lower solutions and the perturbation theory of self-adjoint
operators, we can describe some sets of Webster scalar curvature functions
which can be realized through pointwise CR conformal deformations and CR
conformally equivalent deformations respectively from a given pseudo-Hermitian
structure.
