Section 249 on Judicial Interpretation of the Civil Procedural Act establishes the principle of constant party. However, this provision is so simple that it may be difficult on judicial application, thus we should analyze it from the interpretation theory. On the principle of free disposition and principle of no influence in the original proceedings, restrict successor's way and range of disputed civil rights and obligations. Besides, we should protect heirs' rights of litigation participation. On one hand, Heirs could apply for the qualifications to participate as accessory intervener or inherit proceedings. On the other hand, heirs shall not revoke the action as third party. Finally, valid decision produce adjudged force to heirs. When applied principle of bona fide acquisition, judicial decision haven't effect on heirs.%《民事诉讼法》司法解释第 249 条确立了当事人恒定原则,但该解释规定过于简略,可能存在适用上的困难,需要从解释论上予以回应,具体做法是:在坚持自由处分原则与于原诉讼无影响原则前提下,对争议民事权利义务的继受方式和范围进行限制;保障继受人诉讼参与权利,继受人可以申请以无独立请求权第三人的身份参加诉讼或者承担诉讼,并且不可以提起第三人撤销之诉;生效裁判对继受人具有既判力,当继受人的权利是基于善意取得或系争物时,既判力不及于自无权利而善意取得权利的第三人.
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