Sponsored by the Tianjin Municipal Environmental Protection Bureau, the Swedish Environmental Science Research Institute, IVL, Tianjin public transport group, Scania and other government departments and enterprises, Tianjin's "biogas purification green bus" project has been supported by the Tianjin municipal government. As a preliminary coordination organization and technical support unit of the project, SEC plays a bridge role through its own advantages and connects the two and the two countries closely. The implementation of the project also played a positive role in promoting the development of SEC itself, and improved the reputation of the enterprise.