本文根据物质分子结构的基本概念和对比态原理提出了一个表征物质特性的新参数——构形因子ζ,其定义为使用对比温度Tr=0.7的饱和液体体积数据,作者计算得到了40种物质的ζ值,该参数具有清晰的物理意义,数值范围比较适宜,规律性也较好.它可用来关联热力学性质和传递性质而具有较好的精度,例如,关联纯物质的第二维里系数时,计算得18种纯物质的压缩因子的平均误差只有0.8％。 In this paper, we propose a new parameter characterizing the physical properties, ζ, which is defined as the volume of saturated liquid with a contrast temperature Tr = 0.7. According to the basic concept of the molecular structure and the principle of comparative principle, the authors calculated 40 species The parameter has a clear physical meaning, the numerical range is more appropriate, regularity is also good.It can be used to correlate the thermodynamic properties and the transfer properties and has good accuracy, for example, associated with pure Vernier coefficient , The calculated average compressive factor for 18 pure substances was only 0.8%.