The double-wing expansion house is also called the double-wing folding house. it usesgalvanized high-strength square pipe, galvanized angle iron and other light steel materials asthe frame, and the anti--corrosion double-sided color steel composite plate is used as the wall. The frame question uses high-strength hinges for street connection. After reasonable design. it has expanded nearly three times, Expanded houses of 20 feet and 40 feet can be made. which can also be customized according to customer needs.