Web Service is always subject to change. As more enterprises choose to migrate to Service-oriented Architecture (SOA), the Web services and their stakeholders are facing a more distributed and dynamic environment. The evolution ofWeb services consumer requirements and the competitive pressures encourage web service providers to always make efforts to improve and update services by publishing continuously new versions. In this context, each participant in SOA will be involved in the issue of the Web Service evolution. Before reacting to this evolution, an impact analysis must be done to estimate the sideeffect caused by the changes that occur during the evolution. In this paper, we propose an impact analysis model based on the change-centric Web Service evolution model and dependency impact analysis model. It can be used for estimating the impact of Web Service evolution for different stakeholders.