Evaluating projects is one of the key activities in managing projects, and thus it should be implemented as a part of the entire project management system. However, currently deployed evaluation systems suffer from several deficiencies such as the lack of supporting distributed environment and integrity. In this paper, the web service technology is applied to evaluation management systems. The process of evaluation is designed based on the web service, and a pilot system is implemented to test the feasibility of the technology to the domain of project evaluation.