Section 337 of the United States is the abbreviation of Section 337 of the United States Customs Tax Law 1930, and is now compiled in Section 337 of the United States Code 19. The predecessor of "Article 337" is Article 3 16 of 1922 Customs and Tax Law, and it is named according to Article 337 of 1930 revised American Customs Law. Since then, American trade legislation has constantly revised and developed this clause. The most influential factors in determining the substantive structure and procedural operation of the current Section 337 are the Comprehensive Trade and Competition ActNo. 1988 of Title 28 of the United States Code and the amendment to the Uruguay Round Agreement ActNo. 1995. This clause has become one of the important trade protection measures in the United States.