1. Move the crane and connect the hook to the lifting ring of the crane beam. When the crane is raised to a suitable height, check whether the crane beam is level and the chain is knotted. 2. Then move the main beam to the top of the suspended object and connect it with the sling, then slowly lift the sky. The main beam is the main load-bearing combination, which has a Factor of safety of 4.5% . 3. Test lifting balance: after lifting the crane, the balance degree of the main beam should be less than 1 ° , with the naked eye to observe whether the bearing beam is in the balance state, when it is completely in the balance state, it can be lifted. Four. Load test lifting: load test lifting process is the final process of overall preparation, the last part of the whole process of operation, should slowly lift the load, when just off the ground, stop lifting, observe the overall force situation, then slowly relax the load, if there is no abnormal, can be normal lifting.