When a part of the decoration such as external doors and windows is damaged, whether it can be disassembled and replaced flexibly and conveniently is directly related to factors such as whether the function of external maintenance can be maintained and whether the structure can be affected. Therefore, our company requires that the doors and windows must be replaceable in the structural design, and the disassembly and assembly must be convenient, and the normal use of the external maintenance system cannot be affected.