Some steel tubular piles located at the rear crane rail of Kribi deep sea port can not be driven into the design bearing layer,and the ultimately bearing capacity of them can't meet the design requirements.So we propose a method of optimizing the pile tip,aiming to improve the ultimately bearing capacity of steel tubular pile driven in stiff clay layer.We also carry out a trial piling of three types of pile tip including open-end,semi-closed and closed on the sit and analyze the set,driving stress and bearing capacity according to the survey of set,driving monitoring,high strain dynamic test and the axial compression static test.Finally,the type of closed pile tip is recommended on the basis of the test results.