The roof system of steel structure villa is composed of roof truss, OSB panel, waterproof layer and roof tile. The floor layout and roof layout of steel structure villa are very different. It is composed of cold-formed thin-walled steel frame or composite beam, floor OSB layout board, supports and connectors. The floor is usually made of directional particleboard, cement fiber board and plywood, The wall is an important reason. Its wall is mainly composed of wall frame column, wall top beam, wall bottom beam, wall support, wallboard and connectors. In the house, it is also equipped with internal transverse wall. This wall is set as the load-bearing of the layout. Its wall column is replaced by the components of C-type light steel structure with light weight, strong bearing capacity, strong tolerance and not easy to deform, Its wall thickness is also set according to the load it receives, usually 0.84 ~ 2mm, and the wall column distance is usually 400 ~ 600mm. It can effectively accept and reliably transmit the vertical load, and it is very convenient to place.