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The isotherms and Griineisen parameters are calculated by using the molecular dynamics (MD) method with an improved Tosi-Fumi pair potential. The results show that the approximate power law dependence of the Griineisen parameter on compression γ = γo( V/Vo )q, with q ≈ 1.078, holds in the temperature range from 298 to 1073K and pressure range from 0 to 60 GPa, and that the Griineisen parameter for a given density of 2.16g/cm3varies with temperature in a wind range from 300 to 10000K, expressed by γ = 1.052 + 0.582exp(-T/4878.56).