Abstract: In view of the fact that the total displacement of the wharf is seldom used as a performance index in the seismic vulnerability analysis of the pile-supported wharf at present, a displacement-based vulnerability analysis method is proposed based on the cloud map method and stripe method respectively. The proposed method takes into account the uncertainty of earthquake ground motion and defines the failure status of the pile-supported wharf based on the strain limits of pile material. In order to illustrate this analysis method, 80 earthquake records are used to analyze the vulnerability curves of the pile-supported wharf by using the cloud map method and stripe method respectively. The differences between the vulnerability curves given by two methods are compared, and the influences from the uncertainty of displacement capacity on the vulnerability curves are analyzed. The analysis results show that there is little difference between the vulnerability curves of wharves established by the cloud map method and the stripe method, which can be neglected. However, considering the small amount of calculation of the cloud map method, it is suggested to use the cloud map method in the vulnerability analysis of wharves. The uncertainty of displacement capacity plays an important role in the analysis of the vulnerability curves, and should not be neglected in the analysis and should be taken into account.