An equation of state (EOS) applicable to both the uniform and non-uniform fluid was established using the second-order perturbation theory, the Duh-Mier-Y-Teran EOS and the direct correlation function obtained by mean spherical approximation (MSA).

• 应用二阶微扰理论； Duh-Mier-Y-Teran 状态方程和在平均球近似(mean spherical approximation； MSA)的基础上获得的直接相关函数； 建立了适用于均匀流体和非均匀流体的状态方程.