The pile supported wharf structure with mudsill is widely applied in the regions on the upper and middle reaches of the Yangtze River in recent years.However,these regions are subjected to the earthquake disaster usually,and it is necessary to investigate the seismic performance of this new wharf structure for providing a reference for the seismic design.The paper presents a study on the effect of mudsill and seismic intensity on the natural vibration characteristics,displacement of decks and piles,moment and damage of piles through seismic response analysis using EI-Centro seismic wave.The analysis results indicate that the use of mudsill is beneficial to promote the structural stiffness and reduce the internal force of piles,resulting in improved seismic performance;with increasing of seismic intensity,the dynamic response of decks and piles is enhanced and thus the damage aggravates,the reduction extent of pile horizontal displacement due to use of mudsill increases and is related to the height of mud surface at piles,and the most adverse position of moment is also related to this height.