The main products of Huarui Company are the manufacturing and assembly work of the cylinder section and main components of the C929 long-range wide-body passenger aircraft of COMAC, including carbon fiber composite structural components such as the left side panel, upper wall panel, right side panel, front lower wall panel, rear lower wall panel, and main lifting module. The middle fuselage is connected to the front fuselage, middle and rear fuselage, central wing box, landing gear, and fairing, and bears various stress states during takeoff, cruise, and landing. It is the most complex and difficult part of the aircraft fuselage structure, and is expected to include 6000+items (165000+pieces) of parts, including 1700+items (1900+pieces) of composite parts.