1. Introduction This seat fixing system is mounted inside vehicle. Generally, if there is a lift installed in the vehicle, there will be a tie down system required. In that case, some seats have to be removed, and the number and utilization rate of seat will be reduced if the tiw down system is not necessary. By using the seat fixing system, vehicle seat can reinstalled if there is no wheelchair passenger, which is convenient for bus driver and bus usage. The advantage of X-804-1 seat fixing system is that if there is a wheelchair passenger, it is convenient to fix wheelchair; if there is no wheelchair passenger, it is also convenient to remount bus seats