The social education is playing a more and more important role in the context of building a lifelong learning society. A science communication event is a kind of social education resource and it improves the citizen's scientific literacy. In order to explore the role of science communication events in the social education and related assessing methods, a science communication event is studied, which concerns with water saving and protecting. This event is held in a science and technology museum and is open to general public. In a questionnaire survey, 1000 valid questionnaires were returned. Based on the analysis of data from the questionnaires, the science communication event is found to have a positive educational impact on its visitors. First, it improves the visitor's awareness of knowledge about saving and protecting water. Second, it helps the visitors to develop an attitude of "saving and protecting water is everybody's social responsibility and one should take part in that move actively" .Third, it is likely to guide visitors to save and protect water in their everyday life. It is indicated that as a social public educational resource, the science communication event is beneficial to public's lifelong learning, better understanding of science, technology and society and to the building of students' knowledge structure. Some suggestions are made. First, the school science education should make more use of science communication events. Second, it is necessary to broaden the target groups and to benefit more people. Third, the science communication event should be designed effectively according the public' need, interest and learning habit.