1. Overload is strictly prohibited: this is an important safety principle. 2. Pre-operation inspection: check whether the structure is deformed, the welds are cracked, the wheels and brakes are normal, and the hoist and sling are intact. 3. Ensure stability: Before lifting, be sure to lock the brakes to ensure that the gantry crane will not move. The ground should be flat and solid. 4. Standardized operation: It is strictly forbidden to stand under lifting objects. Vertical lifting, avoid cable-stayed pulling. Personnel should not stand under or on the side of the crane. 5. Regular maintenance: Regular inspection and maintenance of structures, wheels, gourds, etc.