6, the flatness of the surface flatness of the surface depends on the XPS board production of raw materials and production equipment, the use of native materials xps board, xps extruded sheet production line, the flatness of the surface is much higher than the existing use of secondary recovery materials xps board, during use in order to ensure flatness of the wall, in use, xps extrusion board, wrong seam bonding has been promoted as a new technology, the use of alkali-resistant mesh cloth xps plate surface, with a special anchors fixed after Shenyang xps extrusion mill, in the use of specially treated surface mortar, flatness of the wall is much stronger than in the past to use the EPS system. Further wind pressure resistance performance is weathering an important one, because the system the more wind-resistant capability cavity worse. So the focus will depend on the size of the entire insulation system with the primary bond area. This XPS systems, and EPS systems are non-existent problem. 2, the advantages of XPS insulation system XPS system is that: 1), XPS board has a dense inner surface and closed cell structure. Its thermal conductivity is much lower than the same thickness of EPS, EPS and therefore has relatively better thermal insulation properties. For the same building facades, its thickness can be less than other types of insulation materials. Third, anti-corrosion, durability of the general aging of rigid foam insulation materials easily used for several years, with the attendant result in performance degradation caused by water. The extruded sheet because of excellent corrosion, aging resistance, thermal insulation, water vapor under high pressure, can maintain its excellent performance, service life of up to 30 - 40 years.