利用简并四波混频（ＤＦＷＭ）方法测量二元分子卟啉酞菁的三阶非线性极化系数Ｘ（３）值．得到二元分子卟啉酞菁的ｘ（３）值比它们单元分子卟啉、酞菁的ｘ（３）值大；二元分子卟啉酞菁的ｘ（３）值起初是随链长的增加而增加，链长增至ｎ＝３时，ｘ（３）值达到最大值．当链长进一步增加时，二元分子卟啉酞菁的ｘ（３）值反而下降．这同二元分子中卟啉、酞菁分子由柔性链连接有关．本文对结果给出可能的解释． The Third Order Nonlinear Polarization Factor X (3) Values ​​of Binary Molecular Porphyrin Phthalocyanines were Determined by Degenerate Four Wave Mixing (DFWM) Method. The obtained x (3) values ​​of the binary porphyrin phthalocyanines are larger than the x (3) values ​​of their unit molecular porphyrins and phthalocyanines; the x (3) values ​​of the binary porphyrin phthalocyanines are initially Increases and increases, when the chain length increases to n = 3, the value of x (3) reaches the maximum value. As the chain length increases further, the x (3) value of the binary porphyrin phthalocyanine decreases instead. This is the same with binary molecules porphyrin, phthalocyanine molecules linked by the flexible chain. This article gives a possible explanation of the result.