内容摘要：在司法实践中，因为非债清偿不当得利而引起的诉讼屡见不鲜，而此时，证明责任分配就显得尤为重要。法官在案件事实处于真伪不明的状态时，按照证明责任分配原则对当事人的证明责任进行分配，由未尽证明责任的一方当事人承担败诉风险，这样，证明责任的分配必然要影响到案件的判决结果，涉及到当事人胜诉或败诉的问题，而且和诉讼的公正与否密切相关，而采用哪一种证明责任分配理论，如何正确运用证明责任分配理论，也同样涉及公正与否的问题。本文针对非债清偿不当得利举证责任分配进行一定的研究探讨。

关键词：不当得利 非债清偿 举证责任分配 举证责任倒置

Abstract: In judicial practice, as non-debt settlements of litigation arising from unjust enrichment are very often happened, and allocation of the burden of proof is particularly important in these situations. Judges do the allocation of the burden of proof according to the basic principles when confronted with unknown facts in the cases.That is to say, the burden of proof lying on which party’s shoulder will affect the result of the cases.So the allocation of the burden of proof has very close connection with the justice and fairness. This paper discusses the key problems concerning allocation of the burden of proof in non-debt repayment.

Key words: unjustified enrichment，non-debt repayment， allocation of the burden of proof，liability of pat to the proof opposite place