Seismic vulnerability analysis is one of the most effective tools to evaluate seismic performance of pile-supported wharf （PSW） structures， which can quantify the probability of structural damage under given ground motion parameters. For a typical PSW in this study， the degradation of steel and concrete materials caused by chloride ion induced erosion is explored. Based on the open-source numerical computational platform OpenSees， a two-dimensional finite element model of PSW is created. In this mod? el， the cross-section characteristics of pile considering corrosion effect are adopted in splash zone. The influence of chloride ion in? duced corrosion on seismic performance of PSW structure is discussed. Pushover analysis method is used to determine the seismic demand bound limit of each damage state of PSW. By inputting 80 ground motions to wharf models with different corrosion years， the logarithm regression analysis for the ratios of the capacity and demand are adopted to develop the time-dependent seismic fragili? ty curves. The results show that： Chloride ion induced corrosion leads to the decrease of deck displacement and pile top bending moment， and the slight increase of pile top curvature； During the whole service life of PSW， seismic vulnerability of wharf struc? ture in different damage states increases with an increase of service time.