The Section 337 of the U.S. Tariff Act of 1930 came into being during the 1930’s Great Depression. In the recent economic crisis in 2007, the Section 337 became a useful trade protectionism weapon once again and Chinese enterprises have been the main victims. The intimate relationship between Section 337 and economic crises shows the protectionism nature of Section 337. To discover the relationship between Section 337 and economic crises is helpful for coping with the 337 investigation for the Chinese government, administrations and enterprises