The environmental protection specialty of muffler structure in the project proposal should include the following main contents: the environmental status of the area; possible environmental impact and preventive measures; opinions and requirements of local environmental protection department; existing problems. The environmental protection specialty in the feasibility study report should include the following main contents: (1) the environmental status of the proposed project area; the ecological changes that may be caused by the project construction; the environmental protection standards adopted in the design; the main pollution sources and pollutants of the construction project; the preliminary plan for controlling pollution and ecological changes; and the nursing major should include the following main contents: the environmental status of the construction area Environmental capacity of the project construction area; main pollution sources and pollutants of the construction project; environmental protection policies and standards implemented by the national and local governments; environmental management measures and expected effects; brief description of the impact of engineering construction on ecological and cultural heritage and protection measures; main pollution sources and environmental protection measures of muffler automobile construction project; influence of environmental protection report It is suggested to prepare environmental protection report. The environmental protection chapter (special chapter) of the preliminary design or basic design shall include the following main internal preparation basis; environmental protection laws and standards for design implementation; project overview; characteristic parameters such as types, composition, quantity, emission law, discharge mode, destination, temperature and pressure of main pollution sources and pollutants; comprehensive utilization and treatment measures adopted in the design and expected effect; and; The total amount control of pollutants; greening scheme; environmental protection management organization and personnel; environmental monitoring institutions, facilities and personnel; environmental investment estimation; problems and solutions of automobile muffler. The construction drawings shall be carried out according to the contents and requirements specified in the environmental protection chapter (special chapter) and the contents and requirements of the environmental impact report approved by the environmental protection department.