In this paper, we propose the Service Change Analyzer (SCA) as an enabling tool for analyzing change impact in services and associated business processes. The SCA is built up based on our change management approach focusing on the analysis of dependencies between services and their supporting business processes. Our change management approach includes a service-oriented business process model, a change taxonomy, change impact patterns, and the algorithms for calculating the impact scopes of a specific change. The SCA provides developers a standard practice to change the complicated tasks of change management into a series of simple and standard procedures. The reported results in this paper make a step progress to achieve the automation of change management in the service based environment.