The utility model relates to a composite member tied in a bundle, including first, second member unit, first member unit includes two the 1st G steel component of or back -to -back setting, and secondmember unit includes one the 2nd G steel component, and is first, the 2nd G steel component structure is the same component bottom plate and two component curb plates, relative the turning over of one end orientation of keeping away from the component bottom plate of two component curb plates is rolled over and is had the component pterygoid lamina, the looks remote site of same G steel component's two member pterygoid laminas has the stiffened edge so that two corresponding member pterygoid laminas form the restraint limit towards member bottom plate orientation enstrophe, the 2nd G steel component's a member curb plate is for connecting the curb plate, this connection curb plate links firmly in order to realize firstly with a corresponding G steel component's member bottom plate or corresponding member curb plate, the fixation of second component unit. The stiffened edge is as the free edge, and corresponding pterygoid lamina is for partly retraining the limit, and component curb plate and component bottom plate effectively improve whole composite member's intensity for retraining the limit entirely.