The connection between the air bag and the supporting structure is one of the key technologies of the product. The main root angle, anchor bolt, wedge angle of fixed on the bed after the adjustment in place concrete. The main cast fixture and anchor bolt connection, support in the root angle, the wedge angle on the airbag support department, flip top panel to the upstream side, rely on casting fixture clamping fixed and fixed by a hinge cover plate, and the door body.