This study examines the relationships between the tourist's participation and the co-design in travel services. The result shows that four key factors connect to the participatory design process. First, to co-design new travel services, experiential participation is a significant factor. Similarly, innovative cooperation in these new services which leads tourists to focus on service co-design is viewed as relatively important. Third, tourist's purchase intention is significantly directed by the tourism promotions and purchasing power. In addition, the tourist's loyalty and trust play a relative and positive role in helping enhance tourist's perception and understanding of travel service co-design.