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移动式海洋结构物定位的主要方式是用锚链系泊定位，要了解海洋结构物的运动响应、动力特性等，必须知道锚链的弹性系数。本文给出了锚链弹性系数的定义。从锚链悬链线方程着手，推导出了系泊移动式海洋结构物（主要是移动式海洋石油钻井、采油平台）用锚链的弹性系数的数学表达式。最后，分两种情况进行了讨论，给出了简化条件下锚链弹性系数的数学表达式。
The main way to locate the mobile marine structure is to use the mooring positioning of the mooring chain. To understand the motion response and dynamic characteristics of the marine structure, it is necessary to know the elastic modulus of the mooring chain. In this paper, the definition of anchor chain elastic coefficient is given. Starting from the catenary equation of the chain, the mathematical expression of the elastic coefficient of the mooring chain used in mooring mobile marine structures (mainly mobile offshore oil drilling and oil production platforms) is deduced. Finally, two cases are discussed, and the mathematical expression of the elastic coefficient of the chain under simplified conditions is given.