This study aims to analyze contents of websites which provide health information service. The study reviewed 5 websites and selected 15 sample contents among them. Based on the case model that extracted the contents from the websites, this research analyzed the usefulness of the contents. As a result, the usefulness of all the contents are rated above the average. Among the contents, The active core contents include 'information for librarians', 'information bout cancer', 'health related database', and 'multi-lingual health information'.