Abstract: In the process of offshore oil and gas exploration with remote and complex environment, well blowout accidents will bring subversive disasters to enterprises, such as heavy casualties, serious environmental pollution, and even destroy platforms and cause political and social problems. The one of the most effective solution for blowout out of control is the rescue well, which BP used to contain the blowout in the Deepwater Horizon accident in the Gulf of Mexico. This paper introduces the key technologies of designing offshore rescue wells, including the number of rescue wells, well location optimization, the depth of underground connectivity and connectivity options. Well killing methods,well simulation calculation, and final well abandonment scheme are also presented. This paper puts forward some suggestions for further research on rescue well technology, which also has certain reference significance for China to establish its own technology system of marine rescue well.