  We investigate the dependence of s-wave meson-baryon scattering amplitudes on
different regularizations within the framework of the chiral unitary model. We
employ two different regularization schemes, i.e. dimensional and form-factor
regulariaztions to tame the divergences in the model. We also study the
analytic structures of T-matrices, using those regularization schemes. We find
that while the form-factor regularizaion produces almost the same results as
the dimensional regularization did, the on-shell approximation is to some
extent limited in the case of the form-factor regularization. Having chosen
parameters properly, we show that the regularization dependences can be
minimized.
