Abstract: To address the bottleneck issues of high skidway resource occupancy and poor project scheduling flexibility in traditional skidway traction methods for 10000-ton-class deepwater oil and gas platform modules， this study introduces the mature skidway-free air pad sliding （APS） transportation technology from the shipbuilding industry. Based on application practices in South Korean shipyards， a technical solution integrating air-cushion suspension and hydraulic propulsion systems was systematically developed. By incorporating multi-stage hydraulic jacking devices and path control systems， millimeter-level precision transportation of modules weighing up to 30000 tons was achieved. Engineering validation demonstrated that the APS system reduced skidway resource requirements by 100%， improved project scheduling flexibility by 60%， and shortened transportation cycles by 40%. This research represents the first successful adaptation of APS technology to the offshore engineering sector， establishing a comprehensive skidway-free construction and transportation methodology. The findings provide an innovative solution for China's deepwater oil and gas equipment construction， effectively overcoming the rigid dependence on skidway resources for ultra-large structure transportation.

Key words: skidway-free, APS, large marine structures