摘要： 关于不当得利、无因管理等法定之债的规则，《民法总则》的规定较为简略，需要在民法典分则中予以进一步细化、补充和完善。在中国民法典分则不设置债法总则编的前提下，可以考虑在合同编中规定准合同一章，对不当得利、无因管理等各种债的关系作出集中规定，以实现民法典规则体系的科学性。在引入准合同概念之时，还需要进一步明确其内涵，确定其在合同编中的体系安排，并对准合同一章所包含的债的类型、合同法规则参照适用于准合同之债等相关问题作出规定。

关键词: 民法典, 准合同, 不当得利, 无因管理, 债法总则

Abstract: The legal rules of obligatio civilis such as unjust enrichment and negotiorum gestio, were briefly provided in General Principles of Civil Law, and need to be further refined, supplemented and perfected in Specific Parts of Civil Code. As Specific Parts of Civil Codeof China will not include General Provisions of Obligations, it shall be considered to make quasi-contracts stipulated in Part of Contracts as a separate chapter, in which to regulate centrally negotiorum gestio, unjust enrichment and other obligatio civilis, in order to realize the scientific nature of the civilrules. When the concept of quasi-contractsis introduced, it's necessary to further clarify its connotation, determine its system arrangement in Part of Contracts and its types which shall be contained, and stipulate the rules of Contract Law referring to quasi-contracts and other related issues.

Key words: Civil Code, Quasi-contracts, Unjust Enrichment, Negotiorum Gestio, General Provisions of Obligations