The new steel structure attic is made of generous square pipes or I-beams as columns, the main beams are I-beams or H-beams, and the span beams are double-C beams commonly used in our shelves. Such a structure is connected by screws and belongs to a medium and heavy attic. It is much stronger than our conventional double-pillar attic. It can achieve a large span of 6 meters * 6 meters and load 500-1500kg/square. Compared with pure steel attic, it has a unique price advantage, and the installation is also very beautiful and beautiful.