Abstract: Collaboratively promoting the environmental protection industry with both eco-environmental protection and economic development is an important aspect of the implementation of the national strategy for the coordinated development of Beijing-Tianjin-Hebei. At this stage, Beijing-Tianjin-Hebei has reached a consensus on the coordinated promotion of the environmental protection industry. While affirming that Beijing, Tianjin and Hebei have provided strong support for the coordinated promotion of the Beijing-Tianjin-Hebei environmental protection industry through policy support, technological innovation and increased capital investment, it should be more sensitive to find the unfavorable factors that hinder the coordinated promotion of the Beijing-Tianjin-Hebei environmental protection industry. These factors include poor correlation, insufficient complementarity, low concentration, weak scale, unsound policies and regulations, and lack of rigid restraint mechanisms. At the same time, we should aim at establishing a comprehensive and practical network of legal protection mechanism from the aspects of collaborative planning legal mechanism, docking and benchmarking legal mechanism, scientific and technological innovation legal mechanism, investment and financing legal mechanism and information sharing legal mechanism.

Key words: environmental protection industry, Beijing-Tianjin-Hebei coordinated development, legal mechanism