The Affection of Implementing Environmental Policy Towards Beijing-Tianjin-Hebei Region

This paper makes use of the revision of “Law on the Prevention and Control of Water Pollution” as a natural phenomenon, under the method of Difference-in-Differences to observe the effect of this policy on the reduction of industrial wastewater in Beijing-Tianjin-Hebei region. The research result shows that the implementation of the policy has certain promoting effect to reduce discharge of industrial wastewater. Administrative regulation plays an important role in environmental protection.