Based on the text of the Agricultural Promotion Act of 2018,the 18th Agricultural Act in U.S. history,this paper analyzed the main features and trends of the U.S. agricultural subsidy policy. An overview reveals that this act maintained the continuity and pertinence of agricultural policy,continuing to implement several basic policies enacted in 2014,including the price loss guarantee policy,the agricultural risk guarantee policy,the marketing assistance loan policy and the loan differential payment policy,so as to guarantee farmers’ income,and lifted the level of support and protection accordingly so as to provide farmers with a safer agricultural income network. Simultaneously,the new act focused more on the implementation efficiency of policy projects,trying to build a new safety net to lift subsidy efficiency and strengthen risk management. The Agricultural Promotion Act of 2018 is of great enlightenment for China’s agricultural support and protection system,explicating the direction of reform to the marketization of support mode,the concealment of protection means,and the efficiency of project implementation,etc.