In this study, a research is conducted on backpackers' continuing use in travel websites based on Expectation Confirmation Theory (ECT). Efforts are made to generalize factors that influence continuing use behavior through the literature review on the topic of websites' characteristics, information technology adoption, and Information systems success. So far, there hasn't been any research in ECT investigating continuing use in subjects of backpackers. Therefore, we extended the variables of ECT to better explain the continuing use of travel websites under different context. This research subjects were mainly focused on backpackers in Taiwan who used to travel domestically or internationally on their own rather than traveling through the arrangement of travel agency. Data analysis is conducted via LISREL statistical analysis, with 251 valid questionnaires returned. This study concludes five main results with using travel websites, including: (1) Perceived quality (information quality, system quality and servi