This is different. The bus chassis frame is mainly composed of the bus interior floor, seats, steps, handrails and engine compartment. It is mainly used to support the floor, and the embedded plate is reserved under the floor to drill holes to fix the seat and armrest and then install bolts. The frame of the chassis is mainly used to install some functional components such as fixed engine and gearbox, and most of the components are basically installed on the frame. The traditional bus chassis skeleton is fixed on the frame through the bracket and the body, but the vehicle-mounted body appears, and the floor skeleton is also integrated with the frame, which is actually only a functional difference.