In the current Chinese code，design methods are lacking in spring anchorage structures for marinas.We briefly introduce the style and principle of the spring anchorage structures and analyze their advantages and disadvantages.Based on the operating requirements of marinas，we propose a layout pattern of spring anchorage systems and raise the requirements for spring length calculation.Due to the complex structural calculation of the systems，it is difficult to simplify the calculation into a two-dimensional problem and draw conclusions by hand calculation.The 3D finite element method is appropriate.A simplified calculation method is proposed，which can realize the self-balance of vertical load calculation for spring anchorage systems.