  By introducing the dressed Polayakov loop or dual chiral condensate as a
candidate order parameter to describe the deconfinement phase transition for
light flavors, we discuss the interplay between the chiral and deconfinement
phase transitions, and propose the possible QCD phase diagram at finite
temperature and density. We also introduce a dynamical gluodynamic model with
dimension-2 gluon condensate, which can describe the color electric
deconfinement as well as color magnetic confinement.
