In order to evaluate the sealing ability of premium connection,by fully considering the effect of helix angle on the performance of premium connection,the three dimensional finite element model of a certain type premium connection was established by ABAQUS software.When exerting the loads in series B test of ISO 13679 on the premium connection,the distributions of Von Mises stress and contact pressure in various cases were studied. The results show that the bending load has a great influence on the distribution of Von Mises stress and contact pressure of premium connection.The distribution of Von Mises stress and contact pressure on the sealing surface of premium connection is the same,that is,the Von Mises stress and contact pressure on the sealing surface are smaller on the tension side and greater on the compression side.With the increasing of axial compression load,the contact pressure on the tension side is decreased,which may raise the sealing failure of premium connection.