By establishing a comprehensive index system of cities, this paper uses gravity model to measure the economic connection intensity of cities in Guangdong Province, and divides cities into four levels by k-means clustering analysis. The first level city is Guangzhou, which ranks first in the total economic connection intensity of the whole Guangdong Province. The second tier cities are Shenzhen and Foshan; The third tier cities are Dongguan, Zhuhai, Zhongshan, Jiangmen and Huizhou. The rest of the cities ranked fourth. Combining qualitative and quantitative analysis methods, this paper puts forward two suggestions on "measuring the economic radiation of the Guangdong-Hong Kong-Macao Greater Bay Area to the surrounding cities" : strengthening the economic strength and strengthening the radiation subjects; Make use of location advantages to improve traffic accessibility.
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