With the development of online tourism products, the preference of online tourism consumer and whatever has impact on the purchase intention are heated in the research. Online telepresence leaving the first impressions of online service to consumers has an increasingly important impact on tourism marketing. This paper focuses on the tourism products of online travel agency (OTA), and regards the online telepresence as an independent variable in order to investigate the impact of physical presence and social presence on the purchase intention of tourism consumer using the experimental methodology. The experiment takes college students as participants, and sets up two experimental scenarios by browsing the B&B products information in different order. Finally, we test the intensity of consumers' telepresence and purchase intention of B&B(bed and breakfast). The results show that the more vivid the online website of the agency, the higher the intensity of the online telepresence, and the purchase intention will also be enhanced. The physical telepresence with pure pictures will not significantly raise the purchase intention, but communication on the website can effectively increase social telepresence and improve the purchase intention of consumers significantly. Relative enlightenment of the above conclusions on online service channels are also discussed in this study.