介绍了环状分子结构的规范化编号中区分局部性质（原子连接度、原子性质、邻接键型、邻接权重和）相同，但远程性质不同的环员原子的优先次序的方法，并举例说明了伪树码的表示方法。结果表明，伪树码适于解决环状分子结构规范化编号中区分局部性质相同但远程性质不同的环员原子的优先次序问题。 We introduce the method of prioritizing ring atoms with the same local properties (atomic degree of connectivity, atomic properties, contiguous bond types, and adjacency weights) in the normalized numbers of cyclic molecular structures, and illustrate the pseudo Tree code representation. The results show that the pseudo-tree code is suitable to solve the problem of prioritizing ring members with the same local properties but different remote properties in the normalized numbering of the ring molecular structure.