摘要:在贸易自由化的发展的今天和全世界环境保护浪潮的兴起，环境问题与贸易之间亦开始不断出现摩擦，不相融合。时间的不断流逝以及与其相伴随的人们认识的发展保护环境和自由贸易之间的关系的平衡提供了一个磨合期，并在GATT1994第20条环境保护例外条款的判例法中得到了基本实现。虽然环境价值优先于自由贸易已是普遍的观点与认识，但是为实现环境价值利益而采取环境贸易措施时必须予以严格的限制，以防止该措施被过度滥用，从而损害其他国家的合理贸易利益。通过对其原因的探究，并且基于对该条款在各案例中的适用状况进行分析的基础上，从而为我国在以后的的环境保护例外条款的使用上提供借鉴之处。

关键词：  环境保护，例外条款，自由贸易 

ABSTRACT:Along with the development of trade liberalization and the rise of global wave of environmental protection, the conflict between trade and environment problem is increasingly serious. But after years of gradual development, the relationship between environmental protection and free trade has been in GATT article 20 environmental exceptions to the case law in the basic balance. While acknowledging the environmental value takes precedence over free trade, in terms of environmental trade measures to the strict restrictions. Through a study on the reason, and based on the terms and conditions in all the cases on the basis of the analysis of the suitable situation, thus for our country on the use of future environmental protection exception clauses provide reference.

Key words: Environmental protection, Exception clauses, Trade liberalization