Pressure-in shelves are between front and rear multi-storey car beam overlap phase, put the tray from the outside (or bins) trolley pushed back the original goods store the goods will push entered. Trolley rides on the inclined orbit, when outside of the cargo is removed, the inside of the trolley will automatically slide down. Push-shelf storage capacity, high utilization of space, for small species, large quantities of goods, advanced out of the way after the operation, purchase and ship in the same side.