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对价连接性值δｖ实行了改造，重新定义了价连性值δ－ｉ，认为分子中某一原子的特征数值δ－ｉ与某原子的价电子数、成键电子数、价电子层的最高主量子数有关。对于碳氢体系，顶点的连接度、δｖ、δ－ｉ具有相同的数值。对于含杂原子体系，δ－ｉ具有更大的适用范围，给出两个例子论证之。同时，δｖ、δ－ｉ具有相似的定义形式，所以由δｖ构成的各级价连接性指数ｍＸｖｔ的方法可以完全移植过程，由δ－ｉ构成的拓扑指数记为ｍＸ－ｉ。作为检验，用１Ｘ－研究了３６种卤代苯的水溶解度和辛醇／水分配系数，结果１Ｘ－比１Ｘｖ有显著改善。
The valence connectivity value δv has been modified to redefine the valence value δ-i. It is considered that the characteristic value δ-i of a certain atom in a molecule is related to the valence number, the number of bonding electrons, the highest valence electron layer The main quantum number related. For the hydrocarbon system, vertex connectivity, δv, δ-i have the same value. For heteroatom-containing systems, δ-i has a larger range of applicability, giving two examples to prove. At the same time, δv and δ-i have similar definitions. Therefore, the method of mxvt at various levels consisting of δv can be completely transplanted. The topological index composed of δ-i is denoted as mX-i. As a test, the water solubility and the octanol / water partition coefficient of 36 kinds of halogenated benzenes were studied by 1X-1. As a result, 1X-1Xv was significantly improved.