The problem of air pollution in China comes along with the process of industrialization and urbanization, which is mainly caused by human activities. Recently, although China has achieved certain results in the process of air pollution prevention and control, it is mainly an one-way management mode dominated by the government in the process of prevention and control, which tends to cause problems such as low efficiency and unreasonable treatment methods. Therefore, the main purpose of this study is how to effectively prevent and control air pollution. On the one hand, this paper attempts to quote the analysis results of various literatures on China's air pollution control policies. On the other hand, this paper introduces the causes of air pollution and the changes of air pollution control policies in China. This article analyzes the problems that should be reflected in the process of air pollution control in Lanzhou, which was one of the ten most polluted cities in China. Finally, it points out the improvement directions for the prevention and control of air pollution in the future; (1) It is the time for local governments at all levels to strengthen cooperative exchanges and ensure the efficient allocation of various equipments, technologies and other resources. It is a necessary condition for successful control of air pollution. (2) Although the primary source of air pollution is the industrial activities of enterprises, the development of enterprises is also one of the important means to promote regional economic development. So, in the process of air pollution prevention and control, the benefits and costs of enterprises should also be taken into account, and the development obstacles faced by each enterprise should be considered. (3) It is necessary for the government to pay attention to the openness and authenticity of environmental information. It is no doubt that a good and transparent social environment helps to promote the convergence of other forces. (4) The basic right of the public to participate in environmental protection should be guaranteed as far as possible.