从Barker Henderson的硬球微扰理论出发导出了一个新的状态方程 ,其形式与马丁 侯状态方程十分相似 ,其全部常数可以按马丁 侯方程的方法求出 ,只需要临界点与一个蒸气压点的数据便可较精确地预测流体的P V T性质 .利用其特性常数与分子微观参数的关系可以求出流体分子的微观参数 A new equation of state is derived from Barker Henderson’s hard-sphere perturbation theory. The form of the equation is very similar to the Martin Hou equation of state. All the constants can be obtained by the method of Martin Hou equation, and only the critical point and one vapor pressure point The data can be more accurately predict the PVT properties of the fluid.Using the relationship between its characteristic constants and molecular micro parameters can be obtained fluid molecular micro parameters