Abstract: Spudcan structure is the most important part of jack-up unit, and its reasonable design and structural strength are the key points to the unit’s performance and safety. Taking a spudcan structure strength analysis of BHCP400 self-elevating drilling unit as example, through the analysis of seven kinds of conditions including preload, storm survival load and eccentric load, we establish a spudcan structural model. The finte element analysis results show that the maximum von Mises stress for all load cases is at the radial bulkhead at leg chord, the bottom plate, the supporting plate of chord, and the brackets connecting chords and spudcan. For these places, large thickness and high strength steels should be used, and the requirements of welding quality and precision should be met. In addition, we should pay attention to the eccentric load case for which the spudcan stress reaches its maximum.