摘要： 《合同法》第80条的规范意旨在于保护债权让与中债务人的利益。让与通知作为准法律行为之观念通知，准用民法关于意思表示的规定。让与通知之主体原则上应为债权人；受让人对债务人提起诉讼，只能视为通知的一种特殊情形；债权让与公告本身不能视为通知或作为其替代方式。本条第1款前句规范的是债权让与之内部关系，后句则规范其外部效力。只要通知到达债务人，债权让与即对债务人发生效力，其即使向债权的非归属方清偿亦为有效；通知之前债务人清偿的效力以及通知之后的表见让与制度也以债务人的保护为依归。在双重让与的处理上，应遵循“先来后到”规则，并贯彻保护债务人的规范目的。

关键词: 让与通知, 债务人之保护, 债权让与之外部效力, 表见让与, 双重让与

Abstract: The normative purpose of Article 80 of the Contract Law is to protect the interest of obligor where the obligee assigns his rights to a third party assignee.As a notional notice, the notice of assignment is a type of quasi-juridical act and shall follow civil law rules on the expression of intention.In principle, the obligee shall be the person to make the notice.The lawsuit brought by the assignee can only be regarded as a special form of de facto notice.The public notice of assigning the debt by the obligee to the assignee as such shall not be regarded as the notice or a replacement of the notice.The first half sentence of this provision regulates the internal relationship of the assignor and the assignee, the second half sentence regulates the external relationship.The notice becomes effective when the notice reaches the obligor.After that, the discharge of obligation by the obligor is effective even if the obligation was discharged towards a person previously not entitled to this right.The legal effect of discharging the obligation before the notice and the apparent assignment are also to protect the interests of the obligor.The handling of double assignment shall follow the rule of“first come, first served”, and shall achieve the normative purpose of protecting the obligor.

Key words: Notice of Assignment, Protection of Obligor, the External Effect of the Assignment, Apparent Assignment, Double Assignment