Sigma membrane structure belong to Sigma Group , Sigma Group include four company : Sigma membrane structure, Senmo membrane structure, DongQiao steel structure, Sigma HongKong; we are earliest professional membrane structure with steel structure enterprise in China. Our Group annual sales volume total amount more than 600millions RMB.Sigma HongKong estabilished in 2005, annual export volume more than 10millions US Dollars;Senmo membrane structure established in 2006 , annual sales volume more than 120millions RMB;DongQiao steel structure established in 1999, annual sales volume more than 300millions RMB;Sigma membrane structure established in 2015, annual sales volume more than 80millions RMB2006 SHENZHEN OCT GROUP SUPPLIER 2007 CHINA COUNTRY GARDEN HOLDING GROUP SUPPLIER 2008 CHINA HIGH SPEED TRAIN STATION SUPPLIER 2009 SHENZHEN METRO STATION SUPPLIER 2010 OLYMPIC ASIA GAMES STADIUM SUPPLIER 2010 SHANGHAI EXPO MEXICO EXHIBITION HALL SUPPLIER 2011 THE 26TH UNIVERSIADE BYCLE STADIUM SUPPLIER) 2012 CSCEC OVERSEAS SUPPLIER 2013 BAO'AN INTERNATIONAL AIRPORT SUPPLIER ZAMBIA LUKASA COUNTRY STADIUM SUPPLIER 2014 NJ WORLD YOUTH OLYMPIC GAMES STADIUM SUPPLIER 2015 FOREST CITY OF MALAYSIA SUPPLIER 2016 FIFA U20 WOWEN'S CUP FOOTBALL STADIUM OF PAPUA NEW GUINEA SUPPLIER 2017 HONGKONG-ZHUHAI- MACAO CROSS-SEA BRIDGE SUPPLIER