Abstract: To effectively promote the coordinated development of regional tourism in Guangdong Province, the internet attention degree of Baidu index from 2012 to 2018 and the social network analysis method are used to study the structural characteristics of tourism contact network in cities of Guangdong Province and the mechanism for their formation. The following results are obtained. First, the density of the tourism contact network has been increasing, the concentration of the network has been declining and the network develops in the direction of equalization. Second, the factional structure of tourism networks of four regions of Guangdong Province is not obvious. Nor is the "club" effect. But the "core-edge" structure are relatively obvious. The cities in the Pearl River Delta, especially Guangzhou and Shenzhen, have always been in the core area with a high point center degree, belonging to the first echelon in the MDS chart. The cities such as Dongguan, Foshan, Huizhou and Zhuhai are in the second echelon, and the rest of the cities fall into the third echelon. Third, the main factors affecting the strength of the tourism network in Guangdong Province are time, distance, spatial neighbor effect, economic development and tourism resources.