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目前 T 型井技术在陆地油田和海上导管架平台成功实施多井次作业，已成规模化应用；本文针对该技术如何在海上半潜式平台应用的关键点进行探讨。以南海某井为例，介绍了如何利用悬挂器、水下旋转头配合抗磨补芯克服半潜式平台上下浮动的影响，精准控制开窗、造斜阶段进尺的几项关键性技术，保证造斜结束后的井斜达到设计要求，填补了该技术在海上半潜式平台领域应用的空白。“,”at present, T-shaped well technology has been successfully applied in many wells in onshore oilfield and offshore jacket platform, and has become a large-scale application. This paper discusses the key points of how to apply T-shaped well technology in offshore semi submersible platform. Taking a well in the South China Sea as an example, this paper introduces several key technologies of how to use the hanger, underwater rotary head and anti-wear core to overcome the influence of floating up and down of semi submersible platform, and accurately control the footage in the window opening and deviation making stage, so as to ensure that the well deviation after deviation making meets the design requirements, and fill in the blank of the application of this technology in the field of offshore semi submersible platform.