1. The operator must not stay on the frame. 2. The operation should be performed in accordance with the lift operation procedures and operating procedures. 3. There must be no construction load during the lifting process. 4. All obstacles that hinder lifts should be demolished. 5. The constraints of all the impact on lifting operations should be lifted. 6. The altitude difference between the adjacent promotion points must not be greater than 30mm. The overall rising difference must not be greater than 80mm.