Abstract:Brucellosis is an acute or chronic zoonotic infectious disease of various animals caused by bacteria of the genus Brucella. Sunan County is a Category II area for the prevention and control of brucellosis among livestock. In order to analyze the reasons for the rebound of brucellosis among livestock in some parts of the county, the animal husbandry and veterinary departments at the county and township levels carried out a special investigation and epidemiological analysis of the source of brucellosis among livestock. This initially clarifies the main reason for the rebound of brucellosis. This provides practical suggestions for further carrying out the prevention and control of brucellosis among livestock.