Gi corrugated steel metal roofing sheet in the aspect of plate structure and standard, the second generation pressure plate products such as undercut structure, buckle structure and fastener concealed connection are presented. There is a mature application of the closed slab floor; with is pressed plate coating plate (substrate) increased the varieties of aluminum plate, galvanized aluminum plated, coated plate increases the partial polyvinyl fluoride (pvdf) coating plate coating, high resistance to polyester (hdp) new products such as; relevant international "continuous hot galvanizing steel sheet and steel belt", "color coated steel sheet and steel belt", "steel structure project construction quality acceptance code" and so on. Into the 21st century, our country national economy high speed steady development, caitu pressed corrugated plates have also been around from general industrial buildings into the large public buildings, such as airport terminals, railway stations, stadiums, concert hall, theatre, the 2008 olympic venues. Building roof, floor and metope uses the mechanical type plate and the connection is more reasonable, the construction method is more scientific and better anti-corrosion performance aluminium zinc plate, aluminum, magnesium, manganese alloy plate, titanium plate, stainless steel and so on research and development, greatly improve the level of the application technology of subtypes metal plate. 1. Grade: dx51d, g550, sgcc, st01z, csa, csb, fsa, fsb, dds 2.