In order to promote the Belt and Road(B&R) construction, China TNCs should undertake more environmental responsibilities including ten core ones: Environment pollution prevention, Natural resources protection, Clean production, Development of green energy, energy conservation, reducing energy and resource consumption, Conservation of biological diversity, Green R&D, Promotion and transfer of advanced environmental technology, Financing environmental public interest activity, Green product, and Raising environmental awareness and promoting public participation. China TNCs should establish their own environmental responsibility index system, develop their own environmental technology reference to developed countries' environmental laws, regulations and standards. China government must take practical actions to support TNC so as to fulfill their environmental responsibility and the NGOs should become the effective supervision force.