This paper makes an empirical study on relations between U.S. antidumping and the import, output, and FDI of U.S.' manufacturing industry during 1980-2007 with VAR model and IRF method. It finds that import and output are crucial factors determining U.S. initiating antidumping, but FDI also plays a role in a mid-to-long term. In general, antidumping does have an obvious remedy effect on the industry in a short term, but...