The structural strength of the jack up platform is the key issue in the design of ship and offshore engineering structures. To carry out the strength calculation of the jack up drilling platform has an important significance for improving the design capability of offshore engineering products and enhancing the market competitiveness of shipbuilding enterprises.Based on the CJ46 jack-up drilling platform project built by Shanghai Waigaoqiao Shipbuilding Co. Ltd., the yielding strength of platform hull structure is checked according to ABS rules; considering the fact that the jack-up platform bears different environmental loads (wind, wave and current) under different working conditions, the environmental loads are calculated according to the rules, and the finite element software MSC. Patran/Nastran is used then to establish the platform hull 3D finite element model and its yielding strength is calculated. The calculation results show that the structure strength requirements are met and the structural stress in the connection region between the spud leg and the main hull is big, where special attention is to be paid.%自升式平台的结构强度是船舶与海洋工程结构物设计中的关键问题。开展自升式钻井平台强度计算工作对提高船企在海工产品上的设计能力，增强市场竞争力具有重要意义。依托上海外高桥造船有限公司承建的 CJ46自升式钻井平台项目，根据 ABS 规范对平台主船体结构进行屈服强度校核，考虑自升式钻井平台在不同工况下所受的环境载荷（风、浪、流）不同，按照规范计算环境载荷，然后应用有限元软件MSC.Patran/Nastran建立平台主船体三维有限元模型并计算平台主船体屈服强度，校核结果满足结构强度要求，结果显示桩腿与主船体连接处的结构应力较大，应该重点关注。
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