Al-Mg-Mn plate is a kind of roofing and exterior wall material with high cost performance. Aluminum alloy has been widely used in the construction industry, which has played an important role in the development of modern architecture in the direction of comfort, light weight, durability, economy and environmental protection. AA3004 Al-Mg-Mn alloy is widely regarded as a roofing and exterior wall material with a design life of more than 50 years because of its moderate structural strength, weather resistance, pollution resistance and easy bending and welding processing. According to the architectural design of maritime climate, 5052 marine aluminum alloy material with stronger corrosion resistance can be selected.