Ship launching or upgrading relying on air-bags is an innovative technology having utmost developmental prospect in shipbuilding. It overcomes the disadvantage of fixed launching track by which the productive abilities of shipbuilding and ship repair were limited in the small and medium sized shipyards. Now it has become a Flexible Launching Technology full of mobility, having advantages in saving effort, saving time, saving work load, saving investment, flexibility, safety, reliability, outstanding comprehensive economy benefit etc. In the meantime, Hoist Air-bags also can be used to transport heavy goods such as prefabricated pier, bridge, well drilling platform, derrick etc.