Hardware mechanical and electrical industry with reduction, reuse, and resource into the principle, focus on resource consumption and waste emissions reduction. Increase the input of science and technology, and reduce the energy consumption when smelting metal raw materials, more to the recycling of waste water, waste gas, waste residue. Hardware products processing enterprises to develop the industrial circular economy in order to promote cleaner production, increase investment in energy conservation and emissions reduction equipment, reasonable use of equipment, low carbon economy development path.