The tether of a submerged floating tunnel is taken as a beam subjected to tension,and dynamics and Morison equations are used to set up vortex-induced oscillation equations of the tether.Effects of tether's obliquity,tension and length on its maximal dynamic shearing force and bending moments are discussed.The results show that the decrease of the vertical depth and tension of the tether induce the increase of the maximal dynamic shearing force and bending moment,whereas the decrease of tether's obliquity induces the decrease of the maximal dynamic shearing force and bending moment;the first-order natural frequency of tether is in direct proportion to the tension and obliquity,in inverse proportion to the vertical depth of water.