When the labourer exercise the wage claim right,the employer don\'t have the right of concurrent performing counterargment and the unsafe right of defence,but can have the sequence right of defence.

Study on Carrier s Defence Right of Performance in Contract of Carriage of Goods by Sea;

On Several Issues Relating to the Defense of First-Performance from A Case——An Analysis of a Contract Dispute Relating to the constructing of a OAS;

Clause 67 of China s Uniform Contract Law provides a kind of system of right of exception against carrying a contract which has not ever been touched on theoretically.

Considering the benefits of both parties on the balance of debt,the defense right of simultaneous performance is prescribed in the 66th article of Contract Law of People\'s Republic of China.