Abstract: According to the structure characteristics of the subsea wellhead produced by Kingdream Public Limited Company and taking an oilfield in South China Sea as the project example, the authors calculated the maximum load on the flexible hinge joint on the top of BOP stack by MOSES software and conducted the strength analysis of subsea wellhead by ABAQUS. The analysis verified the safety and reliability of the subsea wellhead, and can provide some reference for similar analysis in the future.