With the rapid development of society in the era of information technology, the tourism industry is also required to connect with new revolutionary technology tools to increase exploitation efficiency. In addition, recently, the impact of the COVID-19 epidemic has caused heavy damage, especially to the tourism industry in Vietnam and around the world. The article focuses on analyzing the factors affecting the Behavioural Intention of the tourist via online networks. The study was conducted using quantitative and qualitative methods based on a survey of 355 tourists in Ho Chi Minh City. The results show that the most important factor affecting the Behavioural Intention to purchase an online tour is Perceived Behavioral Control (β = 0.449), Subjective Norm (β = 0.261), and Perceived Usefulness (β = 0.230).