This paper reviews the current development status of domestic smart tourism，refines two main smart tourism development models，“Big Data Platform” and “Internet +”，and then analyzes the development of smart tourism in the four core cities of the Guangdong-Hong Kong-Macao Greater Bay Area. The study finds that the level of smart tourism in the core cities of the Bay Area does not match its economic and technological strength，and the institutional design of smart tourism does not match the innovation leadership of the Bay Area. The main reason is that the overall status of the tourism industry in the cities of the Bay Area is not high，and it has not received the attention of the city government. And many services of smart tourism have been replaced by traffic information functions of highly developed cities. Therefore，the development of smart tourism in Bay Area cities is relatively backward compared with other cities in China. This study believes that smart tourism projects in the Bay Area need to be adapted to local conditions and fully consider the economic and construction needs of urban development. There is little urgency to develop a big data platform model. The “Internet +” smart tourism development model is more suitable for the Bay Area.