本文把液晶分子看成由硬棒中心与可弯曲的两尾端所组成,两尾端可以相同也可以不同.运用晶格模型对两种不同液晶分子混合而成的体系进行了计算,得出了一系列热力学关系式,用这些关系式,对两尾端对称(即相同)及两尾端不对称的两两混合液晶体系的N-I相平衡热力学量,结果与实验值符合得很好. In this paper, the liquid crystal molecule is composed of the center of the hard rod and the flexible two tail ends, and the two tail ends can be the same or different. By using the lattice model to calculate the mixture of two different liquid crystal molecules, A series of thermodynamic relationships were obtained. Using these relationships, the NI equilibrium thermodynamic quantities for the two symmetric (ie, the same) and two asymmetric two-liquid crystal hybrid systems at both ends of the liquid crystal were in good agreement with the experimental data.