婚姻法完成了回归民法典之路，婚姻家庭编成为民法典中的重要组成部分。我国民法典的婚姻家庭编注重保障婚姻自主权和维护家庭和谐，将“重大疾病”条款从婚姻无效原因调整为了婚姻可撤销原因，实现了法律规范的有效衔接，回应了民众的理性诉求，彰显了婚姻家庭立法的科学性、系统性和连续性。但是，根据当前法律文件以及实践判例的分析研究，笔者发现我国对婚嫁家庭编中“重大疾病”条款的认知，无论是理论还是实践层面都缺乏完整体系和明确指引，在该条款的适用上存在诸多疑难问题。为了更好地保障婚姻当事人的撤销权，让“重大疾病”在法律层面更加明晰地给予人们正确的指引，笔者认为应当对婚姻家庭编中“重大疾病”条款展开深入研究。

本次论文研究将从以下层次展开：

第一章“重大疾病”条款的历史沿革。明确各阶段“重大疾病”条款的内容及变化，对条款内容的变更作初步分析。

第二章“重大疾病”条款的立法目的变迁。从立法目的的角度切入，以各部《婚姻法》、《民法典》婚姻家庭编及其他相关法条的内容为指引，分析“重大疾病”条款内容改变的合理性。

第三二章“重大疾病”条款的适用问题。通过判例搜集和研究，对“重大疾病”条款在适用中存在的问题进行分析和总结。

第四三章界定“重大疾病”条款的适用标准，完善“重大疾病”条款的认定思路，解决实务中典型疾病的争议。其中界定方向有二：一、对“重大疾病”条款的价值取向进行研究，明确该条款保护的核心价值，为疾病的“重大性”的认定提供思路；二、从社会、历史、经济等多个角度，建立“重大疾病”的一般认知和适用规则。

第四章结合前述内容，提出“重大疾病”条款的适用建议，落实适用方案。

综上所述，本文分为三个部分：一梳理“重大疾病”条款的发展历程，对其作出的改变进行合理性论证；二指出该条款在实际适用中存在的问题；三界定“重大疾病”的定义和范围，解决适用难点。

The Marriage Law has completed the road of returning to the Civil Code, and the Marriage and Family has become an important part of the Civil Code. The compilation of Marriage and Family in the Civil Code of China pays attention to the protection of marriage autonomy and the maintenance of family harmony, adjusts the clause of “serious illness”from the invalidity of marriage to the revocable cause of marriage, realizes the effective convergence of legal norms, and responds to the rational demands of the people, it shows the scientificity, continuity and systematicness of marriage and family legislation. However, based on the analysis and research of current legal documents and practical cases, the author finds that there is a lack of a complete system and clear guidance in both theoretical and practical aspects of our country’s understanding of the “serious illness”clause in the Marriage and Family Code, there are many difficult problems in the application of this clause. In order to better protect the right of revocation of the parties to marriage, and make the “serious illness”in the legal level to give people more clear and correct guidance, the author believes that the “serious illness”provisions in the Marriage and Family Code should be studied in depth.This paper will be carried out from the following levels:

The first chapter “serious illnesss”provisions of the historical evolution. Make clear the contents and changes of the “serious illness”clauses in each stage, and make a preliminary analysis of the changes in the contents of the clauses.

The second chapter is about the change of the legislative purpose of the “serious illnesss”clause. From the angle of legislative aim, this paper analyzes the rationality of the change of the contents of the “serious illnesss”clauses, guided by the contents of the Marriage and Family Code and other related articles.

The third chapter is the problems in application of the “serious illnesss”clause. Through the collection and study of case law, this paper analyzes and summarizes the problems existing in the application of the “serious illnesss”clause.

The fourth chapter defines the applicable standard of the “serious illnesss”clause,consummates the “serious illnesss”clause cognizance mentality, solves the dispute of the typical disease in the practice. There are two directions to define: first, to study the value orientation of the “serious illness”clause, to define the core value of the protection of the clause, to provide ideas for the identification of the “Serious”of the disease; Second, from the social, historical, economic and other aspects, to establish the “serious illnesss”of the general understanding and applicable rules.

To sum up, this article is divided into three parts: First, comb the development of the “serious illnesss”clause, to make a reasonable argument for its changes; Second, it points out the problems existing in the practical application of the clause Third, define the definition and scope of “serious illnesss”, and solve the difficulties in application.