本文对顶点权的含意作了推广:一个图的顶点权不仅能表示该顶点‘自身’的权,也可以代表一个片断图、一个含有同谱点的片断、两个具有等价点的同谱片断收缩的结果.对两点之间的桥也作了同样推广.本文依据收缩定理和同谱定理讨论了同谱点和无约束点的性质,并给予必要的数学证明.还从几个简单图出发,利用上述性质,导出了一系列同谱图. This paper extends the meaning of the vertex weight: the vertex weight of a graph can not only represent the vertex ’itself’ rights, but also represent a fragment graph, a fragment containing the same spectral points, two homographs with equivalent points As a result, the bridge between two points is also generalized.This paper discusses the properties of the same spectral points and unconstrained points according to the contraction theorem and the same-spectrum theorem, and gives the necessary mathematical proofs. Figure out, the use of the above properties, derived a series of the same spectrum.