In this paper, a new concept of Extended Tension Leg Platform is proposed. It is com-posed of four square columns and a ring pontoon which is consisted of four box beams. The new plat-form has less blocks and welds compared to ETLP, so it can be built at a lower cost and in a shorter construction period. Meanwhile, the pontoon extensions in the new platform is part of pontoons, there-fore, the fatigue problem in the welds at the root of extensions in ETLP is solved. A hydrodynamic analysis is conducted to prove the structure’s dynamic stabilities. Based on the three-dimensional po-tential flow theory, the theoretical analysis with numerical calculation is carried out to study the dy-namic characteristics of new ETLP in frequency domain. The added mass force and the potential flow of the new platform damping force are calculated. Considering the coupling between the new ETLP and the tension leg system, the nonlinear dynamic response of the new ETLP is calculated in load combination of wind, wave, flow and the effect of tension leg system. The time domain analyses are carried out and the new platform displacement in time history is obtained. The results proved that the new type of ETLP has a reasonable hydrodynamic characteristic. At the same time, the time domain results of the platform in the South China Sea state environment meet the safety requirements.%文章提出了一种由四个立柱和一个环形浮箱（四个方型截面梁组成）组成的新型延展式张力腿平台。与传统延展式张力腿平台相比，新型延展式张力腿平台有更少的组块和组块间焊缝，因此它的建造成本更低、建造周期更短。新型延展式张力腿平台将延展式结构改进为浮箱的一部分，这就解决了传统平台的延展式结构与浮箱连接处焊缝疲劳损伤问题。文中对结构进行了水动力性能分析以证明其动态响应可靠性。基于三维势流理论对新型平台进行频域内的数值模拟，得到了新型平台的附加质量和势流阻尼。考虑新型平台和张力筋腱系统的耦合作用，分析了新型平台在风、浪、流联合作用下的非线性动态响应。时域分析得到了新型平台在时域内的位移响应。水动力分析结果证明了新型延展式张力腿平台有可靠的水动力性能，并且满足在南海环境条件下的安全要求。
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