Academic researchers have long advocated the importance of assessing the tourism websites. On the basis of predecessors' work, this study proposes an evaluation system of tourism e-commerce websites by the methodologies of AHP(Analytic Hierarchy Process) and TOPSIS(Technique for Order Preference by Similarity to an Ideal Solution). Five famous online websites, including expedia.com, orbitz.com, travelocity.com, ctrip.com and tuniu.com, were selected as examples for examination and comparison. The results show that expedia.com and ctrip.com are the leading websites for abroad and domestic China respectively, which conforms to the real world phenomenon. Suggestions for improvement derived from the results are also included. Not only can this study help owners of practitioners to assess his/her own website in an objective manner, but also recognize the gap between the top leaders of the industry so as, ultimately, to improve the website quality and operational practice.