Abstract: The national agricultural policy is an important part of Chinese whole economic policy, which is an aggregate of macro-control policy measures that effect agricultural development for achieving aim of the development of agriculture, economy and society. The implement of national agricultural policy will give pressure and effect to the environment. Based on the analysis and summarization of the background, objects, stakeholders and instrument of agricultural policy, the conclusion that the agricultural policy affected the agricultural environment by changing the farmer’s yield structure, yield mode, yield technology. The agricultural policies which have great effect are food safety policy, land policy, the policy of improving the farmer’s non-agriculture income, structure adjustment policy and agricultural environmental policy at present. The impacts to the agricultural environment of these policies were analyzed. The policy adjustment proposes were put forward. It include that attach more importance to agricultural environmental problem and ecology construct, integrate the agricultural policy and environmental policy, deepen the innovation of agricultural land use system, confirm the main body of land use clearly, stabilize the land use contract relationship, constitute prompting policy for lightening the agricultural non-point pollution, develop ecology agriculture etc.