Offshore pile structure is strongly influenced by the wave action and has obvious dynamic characteristics.Taking a LNG terminal’s high pile mooring pier as the engineering background,the time-history dynamic analysis of the structure under wave action is carried out by using ANSYS.The results show that under the same wave parameters,the peak values of structural displacement and stress response caused by the simulated irregular waves are about 10%~20% larger than that caused by regular waves,and for the dynamic time-history analysis,the initial drastic fluctuation results can be discarded.