can cancel contract system to follow our country social economic development model constant to change and produce, it is the economic base that determines the superstructural result.

it used the definition of cancelable and invalid contract in the contract law, also that of other countries as references.

该部分借鉴了合同法关于可撤销合同以及无效合同的规定，并考察了世界各国关于无效劳动合同的规定。

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at common law contracts made with a minor that are not valid will be voidable or void.

按照普通法，未成年人签订的合同除有效合同外就是可撤销合同或无效合同。

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a brief analysis of the effect of voidable contract in scheduled period

简析除斥期间可撤销合同的效力

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voidable contract, in scheduled period, is not a valid contract, nor are prospect valid contract and voidable contract but a relatively valid contract with incomplete validity.

可撤销合同在除斥期间，既非有效合同，亦非效力待定合同，更不是无效合同，而是一种相对有效的效力不完全的另类合同。

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some scholars argue that it is a defy towards the conventional theory to establish right to defense of advance or follow-up performance and the system of anticipatory breach of contract.

有学者认为，除此之外，还同时设立了后履行抗辩权和预期违约制度，这是对传统理论的挑战。

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the right of concurrent performing counterargument, is one of important part in the tradition civil law of the continental law. this system is very important to safeguard business transactions, balance the interests between the parties, promote trade.

同时履行抗辩权制度是大陆法系传统民法上的一项重要制度，它对于保障交易安全，平衡当事人之间的利益，促进交易的进行都有着十分重要的意义。

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chapter i dwells on the concept, the history, the characteristics of possessory lien in civil law, and the difference between the possessory lien and the plea of simultaneous performance, the mortgage, and the pawn.

第一章简单阐述了民法上留置权概念，留置权的历史渊源以及特征，留置权与同时履行抗辩权、抵押权、质权的区别。

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to reconcile this tension, the author conducts the analysis from different perspectives to find the connections between the two and integrate the defense right of simultaneous performance into existing theoretical systems.

为了调和此种张力，笔者从不同视角进行分析，寻求二者的关联点以图将同时履行抗辩权纳入既有的理论体系。

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specifically, it is divided into the relationship between the defense right of simultaneous performance and breach obstacles and the relationship between the defense right of simultaneous performance and non-breach obstacles.

具体分为同时履行抗辩权与违约障碍之间的关系和同时履行抗辩权与非违约障碍之间的关系。

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as to the right of defense of concurrent performance in the situation of incomplete performance, there is much flexibility in the contract law of china.

针对不完全履行场合的同时履行抗辩权，《合同法》表现出相当的灵活性。

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in practice, proper application and exercise of the right to plea is essential to maintaining order of transaction and ensuring transaction security.

在实践中如何正确适用同时履行抗辩权，对于维护交易秩序、保障交易安全，有着至关重要的意义。本文对同时履行抗辩权的构成条件、效力及适用范围进行了探讨。

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( 4) while fulfilling the expansion of the right of defense is applicable.

第四：同时履行抗辩权的扩张适用。

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bajie, don't say like that. let's have a good rest and wait for elder brother.

沙僧:二师兄, 不要这么说, 好好休息一下,等待大师兄回来吧.

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saseng: i can be charge of building iron-making line!

沙僧: 我可以负责建炼铁生产线!

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the defense system in the contract law should enhance the regulation about the right of plea against the advance performance and the defense right of the guarantee.

我国《合同法》中的抗辩权体系中应增加规定先履行抗辩权和保证人的抗辩权。

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in the civil law, it is embodied in the right for unstable counterplea, in anglo-american law it is reflected in the right for the anticipatory breach of contract.

在大陆法系体现为不安抗辩权制度，在英美法系则体现为预期违约制度。

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comparative studies of remedies for anticipated breach of contract& also on the legislation defects of arts. 68, 69, 94, and 108 of chinese contract law

预期违约与不安抗辩权比较研究&兼评我国《合同法》第68、69、94和108条的立法缺失

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the article refers to the necessity of uneasy demurring right used in the business activities, the condition of exercising uneasy demurring right and the restriction of misusing it.

本文论及不安抗辩权在商事活动中施行的必要性，以及行使不安抗辩权的条件及对其滥用的限制。

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analysis of implied anticipatory breach of contract and prior performance defence& reexplanation of article 68 and article 69 in the contract law of people's republic of china

辨析默示预期违约与不安抗辩权&重新阐释合同法68条和69条

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the purpose of this paper is to analyse the system of unsafe right of defense and discuss some problems of the application in the judicial practice.

撰此文，意在对不安抗辩权制度作进一步的理论分析，并就司法实践中的具体适用问题进行探讨。

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