本文以Ｌｅｎｎａｒｄ－Ｊｏｎｅｓ势描述惰性原子间的相互作用，将融化的统计几何理论应用到物理吸附在石墨表面的惰性原子单层的固液相变。由相变方程进行严格数值计算所得熔化曲线与计算机模拟实验结果相当接近，所得三相点约化温度为Ｔｔ＝０．４３８，与吸附在石墨表面的惰性原子层实验测量结果和计算机模拟实验的结果也都有相当好的符合。 In this paper, Lennard-Jones potential is used to describe the interaction of inert atoms, and the statistical theory of melting is applied to the solid-liquid phase transition of the inert atom monolayer physically adsorbed on the graphite surface. The melting curve obtained by the rigorous numerical calculation of the phase transition equation is quite close to the result of the computer simulation. The reduction temperature of the obtained three-phase point is Tt = 0.438. Compared with the experimental results of inert atomic layer adsorbed on the graphite surface and the computer simulation The results also have a very good match.