摘要： 民事执行当事人变化的主体范围由生效法律文书执行力扩张的主观范围决定，一般应当包括生效法律文书没有载明的五种主体。民事执行当事人变化程序应当依申请而启动，执行机关不得依职权启动该程序，债务人也不得申请变更或者追加其他主体为执行债务人。对于民事执行当事人变化事由，应当通过言词辩论的方式，由合议庭进行审查并作出裁判。应当完善执行当事人变化的事后救济机制，建立异议之诉和许可执行之诉，确保民事执行当事人变化的程序正当性。

关键词: 民事执行, 当事人变化, 程序构建

Abstract: The range of changed parties in civil enforcement is decided by the extent of subjective expansion of the ex-ecutive force of the legal document, normally containing five kinds of subjects unwritten in the effective legal doc-uments. The procedure of changing parties in civil enforcement should be launched by motion of the parties ratherthan utive organ's act of duty, whereas the debtor shall not apply for the alternation or addition of his ownparty．Moreover, the particulars of the change of parties should be examined and decreed by a collegial bench inthe form of oral arguments. Lastly, to assure procedural legitimacy of this institution, it is necessary to establisha mature relief system, in which motion against the enforcement rulings and litigation of permission for enforce-ment should be contained.

Key words: Civil Enforcement, Parties' Changing, Construction of Procedure