| Safeguard measure is a legal measure to limit the imports temporarily when a product is being imported into one country's territory in such increased quantities that cause or threaten to cause serious injury to the domestic industry. Section 201 is the law on safeguard measures of the U.S.A, which is the comprehensive result of the development of the politics economy and law. So-called Section 201 in effect is Section 2,01-Section 204 of the Trade Act of 1974 amended by the Omnibus Trade and Competitiveness Act of 1988, which stipulates the substantive requirements and procedural requirements of Section 201 detailed. This thesis elaborates why and how the Section 201 came out and analyzes its substantive requirements and procedural requirements. Based on this, this thesis compares the Section 201 with the safeguard measures of WTO, the EU and China. At last, this thesis cites the case of the steel safeguard measures happening in 2002 as an example to analyze the application strategy of U.S.A and reviews the actions that China has taken, and then gives some suggestion on how to improve our safeguard measures and how to make use of DSB of WTO. |