As a new type of structure which has never been built,submerged floating tunnel was studied mainly by numerical simulations.To further study the seismic response of a submerged floating tunnel,the first model experiment of submerged floating tunnel (SFT) under the earthquake was carried out on the unique underwater shaking table in China.The experimental results show that vertical excitation induces larger response than horizontal and different inclination degrees of the tether also cause different seismic responses.Subsequently,based on the fluid-structure interaction theory,the corresponding numerical model is established.And comparing the numerical results with the experimental results,it is shown that the numerical results are basically identical with those of shaking table test.Numerical model adopted is effective for dynamic response of SFT.