Flow rack is also called pallet flow racking, whose rollers are fixed up in the beam of the shelf at a fixed gradient and then put the pallet from the high side and it will be fallen depending in its own gravitation. In order to control the pallet in the steady speed and avoid the collision, a set of damping system will be set up on the roller line at every certain distance since the faster speed pallet slide, the more the resistance that damped system caused. End portion separator system set up at the low end, to separate the two lowest pallets, so that the lowest end of the pallet can be successfully picked up.