In general, the office swivel chair can be divided into three series of large chair, middle shift chair and staff chair. The structural composition of each series of office swivel chair is not the same. Among them, the chair structure mainly includes a high backrest, casters, a soft seat cushion, a five-star foot, a functional chassis, air bars, and armrests. The middle shift chair structure mainly includes low backrest, casters, soft cushions, five-star feet, functional mechanism, and gas lift;