This paper contains three chapters. It centres on the influence of ci-section of maximal subgroup on the structure of finite group.

全文共分为三章，主要是围绕有限群的极大子群的CI -截对群结构的影响这一重要课题进行讨论的。

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By using the concept of almost normal about maximal subgroup, some sufficient and necessary conditions for a finite group to be solvable are obtained.

利用极大子群的几乎正规的概念得到了有限群为可解群的若干充要条件。

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The finite inner-(2,2')-closed groups were classified and this class of finite groups with every non-maximal proper subgroup of even order of(2,2')-closed were also classified.

本文首先分类了内-（2，2＇）-闭群，再对每个非极大偶阶真子群为（2，2＇）-闭的不可解群进行了分类。

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The finite inner-(2,2')-closed groups were classified and this class of finite groups with every non-maximal proper subgroup of even order of(2,2')-closed were also classified.

本文首先分类了内-（2，2＇）-闭群，再对每个非极大偶阶真子群为（2，2＇）-闭的不可解群进行了分类。

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