The focus of haze prevention is how to solve the relationship between social and economic development and the haze prevention. In the current situation where environmental pollution becomes increasingly worse, China needs to enhance the effectiveness of preventing and treating hazy weather. The article first introduces the characteristics of Chi- nese hazy weather, including a wide range, long duration, mainly occurring in areas with low rainfall, severe pollution, great harm, etc.; then it analyzes the causes of China's frequent hazy weather such as the increased particulate hazards in the air and the increased horizontal static wind and vertical temperature inversion; finally, it points out that China's hazy weather has harmed the health of people, exacerbated the deterioration of the ecological environment, affected social and economic development, etc. In recent years, with the large-scale industrialization and urbanization of China and the rapid development of industry, transportation, etc., a lot of exhaust gases are discharged into the air, creating favorable conditions for the formation of China's hazy weather, together with the global warming, significant changes have occurred in weather conditions, so the exhaust gases accumulated in the air cannot be diffused in time, resulting in the frequent occurrence of massive hazy weather in China (1). The disasters of the hazy weather have seriously affected people's daily production and life have brought great challenges to the sustainable development of Chinese society and economy. Many experts and scholars have carried out some exploratory research into the causes and hazards of China's hazy weather. For example, Zhou Tao et al. (2) point out that Beijing's haze concentration is large between 7:00 a.m. and 8:00 a.m. and between 18:00 p.m. and 20:00 p.m. during the rush hours of a day, which indicates that mobile emission sources have become impor- tant sources of urban pollution in Beijing. In addition to the significant increase in haze concentration due to short-period setting off of firecrackers during the Spring Festival, Bei- jing's haze concentration is minimized during holidays, showing that people's activities play a significant leading role in haze concentration; Zhang Liya et al. (3) point out that the causes of China's hazy weather include general at- mospheric circulation, extensive economic production mode, irrational energy consumption structure, excessive vehicle emissions, ground dust and so on; Xiao Hongwei (4) points out that the causes of hazy weather include the increased dust emission due to the accelerated industrialization proc- ess, irrational coal-based energy consumption structure, ur- ban motor vehicle exhaust, environmental capacity overdraft, insufficient environmental pollution monitoring, etc.; Liu Qiang et al. (5) point out that the causes of hazy weather include that total pollutant discharge is too large, loss of self- purification function of eco-environment system, the emis- sion standard of air pollutants is too low, etc. Currently, ex- perts and scholars' analysis of China's hazy weather causes still focuses on several aspects, which is not very compre- hensive and systematic.