This study takes the perception and evaluation of Guangzhou’s urban image by foreigners in Guangzhou as the research object，comprehensively uses the theories of communication，journalism and sociology，deeply analyzes the current situation of the external communication of Guangzhou’s city image through questionnaires and in-depth interviews with foreigners in Guangzhou. Research shows that most foreign respondents in Guangzhou think the GBA strategy will enhance the international communication ability of Guangzhou；most of the foreign respondents prefer to use social media，while use local media less；respondents can well recognize Guangzhou’s modern landmark but the understanding of urban history and culture is insufficient；the respondents agree with Guangzhou “open” international image while considering Guangzhou’s international image is not bright enough. Countermeasures and suggestions are given to enhance the international communication ability of Guangzhou under the strategic background of the Guangdong-Hong Kong-Macao Greater Bay Area，including highlighting the spread of Guangzhou’s urban positioning in the Guangdong-Hong Kong-Macao Greater Bay Area，strengthening the communication cooperation between Guangzhou and other brother cities in the Guangdong-Hong Kong-Macao Greater Bay Area，promoting the establishment of friendly relations between Guangzhou and more internationally renowned cities，constructing a new pattern of international communication based on foreigners’ information acquisition preference，holding international activities to enhance Guangzhou’s “attention” in the field of international communication，cultivating foreigners in Guangzhou as international communication KOL，etc. These also provide reference for the city image dissemination of other cities in Guangdong，Hong Kong and Macao and even mainland cities.