  The effective restoration of the U_{A}(1) symmetry is revisited by
implementing the functional renormalization group approach combining with the
2+1 flavor Polyakov-loop quark-meson model. A temperature-dependent 't Hooft
term is taken to imitate the restoration of the U_{A}(1) symmetry. Order
parameters, meson spectrum and mixing angles, especially the pressure and the
entropy density of the system are calculated to explore the effects of
different U_{A}(1) symmetry restoration patterns. We show then that the
temperature for the restoration of the U_{A}(1) symmetry is much higher than
that for the chiral symmetry SU_{A}(3).
