The primary task of deep-sea platform hybrid model test is to optimize the design of equivalent water depth truncated system. Its purpose is to truncate the system to replace the full depth one to carry out the test. Compared with the full-depth system, work depth of the equivalent depth truncation system is more shallow and span is smaller, but other characteristics of both should be consistent. In this paper, a 100 thou-sand tons, turret moored FPSO working in the 304 m water depth is taken for example, its truncated depth is 76 m, using an improved non-dominated Sorting Genetic Algorithm (INSGA-II) to the equivalent depth system optimal calculation. And the horizontal and vertical direction’s restoring characteristic of total mooring system as well as the static characteristics of a representative single mooring line are taken also into account. The numerical results of this experiment show that the mathematical model and optimal algo-rithm used are effective.%深海平台混合模型试验的首要任务是等效水深截断系统的优化设计，其目的是以截断水深系统替代全水深系统进行试验。等效水深截断系统相比全水深系统其工作水深和跨度较小，但其它特性两者应保持一致。文章以工作在304 m 水深的10万吨内转塔式系泊 FPSO 为例，截断水深为76 m，采用改进的非支配排序遗传算法（INSGA-II）对等效水深阶段系统进行了优化计算，同时考虑了总系泊系统水平和垂直两个方向以及具有代表性的单根系缆的静力特性。此实验数值结果表明，所采用的数学模型、优化方法是行之有效的。
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