Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
; Beijing Univ, Sch Phys, Dept Tech Phys, Beijing 100871, Peoples R China
; Chinese Acad Sci, Inst Nucl Res, Shanghai 201800, Peoples R China
The thermal properties of nuclear matter are studied in the chiral effective Lagrangin in medium with BR scaling based on the framework of the relativistic mean field theory. The basic nuclear properties are reproduced. The mechanical and chemical instabilities are calculated and the phase diagrams are obtained.