Taking 2006~2016 city-level data as a sample, combined with the spatial diffusion effect, the paper explored the impact mechanism of smog pollution, and it assessed the governance effect and transmission mechanism of the smog control policies. The study found that: smog pollution in China during the inspection period had a certain time lag, spatial correlation and space-time “warning effect”. In the past, environmental regulation did not contribute to the expected results in smog reduction due to the near-term transfer of polluting industries between regions. The “Air Pollution Prevention and Control Action Plan” had significant effects on the reduction of the smog concentrations. By 2016, the implementation of this policy has significantly reduced PM_2.5 in the three major economic belts by about 7.1%. Among them, the implementation of urban governance in the central and eastern regions has the most significant effect; since the implementation of the policy, environmental protection departments in various regions had achieved short-term effects of smog reduction by restricting production and remediation of heavily polluting enterprises, but the innovation incentive transmission effect on heavily polluting enterprises had not been significant. Therefore, future smog management policies need to focus more on how to establish long-term effects mechanism by stimulating corporate green technology innovation.