As a key index and parameter to determine the site type in seismic safety evaluation for marine engineering,shear wave velocity is closely related to the strength,shear modulus and predominant period of site foundation soil. However,the shear wave velocities are usually difficult to be directly obtained in situ test,and the test results from laboratory are generally much different from their actual values,it is important to obtain the shear wave velocity parameters through other indirect means for the seismic safety evaluation of marine engineering. In this paper,based on the statistic analysis of the laboratory test results of the shear wave velocity and shear strength of a series of the saturated clayey soil samples from dozens of oil platform projects in Bohai Sea area,we conducted a variety of possible function fittings to determine the empirical relationship between the shear wave velocity V_s and the shear strength S_u. The result shows that the power function V_s=53.751S_u^0.376 represents the best statistical empirical relation among the different fitting curves. The relation function we obtain can provide a simple and feasible method for estimating shear wave velocity through undrained shear strength in marine engineering in Bohai Sea area.