  In the frame work of SU(2) chiral sigma model, the nuclear matter properties
at zero and finite temperature have been investigated. We have analyzed the
nuclear matter equation of state by varying different parameters, which agrees
well with the one derived from the heavy-ion collision experiment at extreme
densities and reliable realistic(DBHF) model at low density region. We have
then calculated the temperature dependent asymmetric nuclear matter, also
investigated the critical temperature of liquid gas phase transition and
compared with the experimental data. We found that the critical temperature in
our model is in the range of 14-20 MeV.
