Abstract: The performance of the HSM-2 premium connection of the Ф244.48 mm×11.99 mm P110 casing is studied by means of the full-scale test and the FEA simulation method.The results reveal that the FEM calculation shows that the main sealing surface maintains a high contact pressure and a large sealing length as well as high sealing index under all the loading points of ISO 13679:2002 CAL IV Series A test.And the results of both the FEM calculation and the full-scale test result demonstrate that the said premiumconnection has reliable sealing performance and connection strength, and that the torque from the FEM calculation is almost identical with that from the test.