从多元混合物的稳定性理论出发 ,建立了基于状态方程的由一个离散组分和一个连续分布组分组成的混合物的临界点和旋节面判椐 .若将连续分布组分看作单一的虚拟组分 ,这些判据可分成两项 ,第 1项与二元系的判别式相同 ,仅与均值有关 ,第 2项则与分布有关 .用vanderWaals状态方程计算了一假想物系的临界点 ,考察了平均相对分子质量和分散度对临界曲线的影响 . Based on the stability theory of multivariate mixture, the critical point and rotational surface criterion of a mixture composed of a discrete component and a continuous distribution component based on the state equation are established. If the continuous distribution component is regarded as a single virtual Components, the criteria can be divided into two, the first and the binary system of the same discriminant, only with the mean, the second is related to the distribution of the VanderWaals equation of state with a virtual object calculated the critical point, The effects of average relative molecular mass and dispersion on the critical curve were investigated.