Taking the Guangdong-Hong Kong-Macao Greater Bay Area as the research area. this paper used OD cluster analysis based on Baidu migration data from January 11 to January 25 (before the sealing-off of Wuhan) and concluded that there is a significant correlation 1the migration level from Wuhan to the GBA and the epidemic severity index. This paper also analyzed the migration levels and d... https://smokeaers.shop/product-category/jars/