A lot of hook holes and round holes are evenly distributed on the front of the shelf column, which is used to the hook of the shelf beam and install the safety pin. Shelf holes are usually in the shape of inverted figures, diamonds or inverted trapezoids, so that the long holes of the shelf columns have a small angle with the vertical direction. After the hook of the shelf beam is hung, it is automatically locked under the gravity of the shelf beam and the goods, and the beam hook is in surface contact with the long hole of the shelf column. The state of the force is better, which ensures that the shelf is more stable and reliable when used. However, the opening of the hook hole of the shelf column has a great influence on the bearing capacity of the column. The bearing capacity after opening is 70% to 95% of the bearing capacity when there is no holes, and it has a greater impact on the small-sized shelf column. Therefore, on the premise of satisfying the load-bearing capacity of the crossbeam hook, the size and number of the column hook holes should be reduced as much as possible to improve the overall load-bearing capacity of the shelf.